Incest
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Incest(/ˈɪnsɛst/IN-sest) ishuman sexual activitybetween family members or closerelatives.[1][2]This typically includes sexual activity between people inconsanguinity(blood relations), and sometimes those related bylineage.It is condemned and considered immoral in most societies, given that it can lead to an increased risk ofgenetic disordersin children in case of pregnancy from incestuousintercourse.
Theincest taboois one of the most widespread of all culturaltaboos,both in present and in past societies.[3]Most modern societies havelaws regarding incestor social restrictions on closely consanguineous marriages.[3]In societies where it is illegal, consensual adult incest is seen by some as avictimless crime.[4][5]Some cultures extend the incest taboo to relatives with no consanguinity, such asmilk-siblings,stepsiblings, and adoptive siblings, albeit sometimes with less intensity.[6][7]Third-degree relatives (such as half-aunt, half-nephew, first cousin) on average have 12.5% common genetic heritage, and sexual relations between them are viewed differently in various cultures, from being discouraged to being socially acceptable.[8]Children of incestuous relationships have been regarded asillegitimate,[where?]and are still so regarded in some societies today. In most cases, the parents did not have the option to marry to remove that status, as incestuous marriages were, and are, normally also prohibited.
A common justification for prohibiting incest is avoidinginbreeding,a collection ofgenetic disorderssuffered by the children of parents with a closegenetic relationship.[9]Such children are at greater risk of congenital disorders, developmental and physical disability, and death; that risk is proportional to their parents'coefficient of relationship,a measure of how closely the parents are related genetically.[9][10]However, cultural anthropologists have noted thatinbreeding avoidancecannot form the sole basis for the incest taboo because the boundaries of the incest prohibition vary widely between cultures and not necessarily in ways that maximize the avoidance of inbreeding.[9][11][12][13]
In some societies, such as those ofAncient Egypt,brother-sister, father-daughter, mother-son, cousin-cousin, aunt-nephew, uncle-niece, and other combinations of relations within aroyal familywere married as a means of perpetuating the royal lineage.[14][15]Some societies have different views about what constitutes illegal or immoral incest. For example, inSamoa,a man was permitted to marry his older sister, but not his younger sister.[16]However, sexual relations with a first-degree relative (meaning a parent, sibling, or child) are almost universally forbidden.[17]
Terminology
[edit]![](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Table_of_Consanguinity_showing_degrees_of_relationship.svg/300px-Table_of_Consanguinity_showing_degrees_of_relationship.svg.png)
The English wordincestis derived from the Latinincestus,which has a general meaning of "impure, unchaste". It was introduced intoMiddle English,both in the generic Latin sense (preserved throughout the Middle English period)[18]and in the narrow modern sense. The derived adjectiveincestuousappears in the 16th century.[19]Before the Latin term came in, incest was known inOld Englishassib-leger(fromsibb'kinship' +leger'to lie') ormǣġhǣmed(frommǣġ'kin, parent' +hǣmed'sexual intercourse') but in time, both words fell out of use. Terms likeincester[20][21][22]andincestual[23][24]have been used to describe those interested or involved in sexual relations with relatives among humans, whileinbreederhas been used in relation to similar behavior among non-human organisms.[25]
History
[edit]Antiquity
[edit]Inancient China,first cousins with the same surnames (i.e. those born to the father's brothers) were not permitted to marry, while those with different surnames could marry (i.e. maternal cousins and paternal cousins born to the father's sisters).[26]
InAchaemenid Persia,marriages between family members, such as half-siblings, nieces and cousins took place but were not seen as incestuous. However, Greek sources state that brother-sister and father-daughter marriages allegedly took place inside the royal family, yet it remains problematic to determine the reliability of these accounts.[27]According toHerodotus,ShahCambyses IIsupposedly married two of his sisters,Atossaand Roxane.[28][27]This would have been regarded as illegal. However, Herodotus also states that Cambyses marriedOtanes' daughterPhaidyme,whilst his contemporaryCtesiasnames Roxane as Cambyses' wife, but she is not referred to as his sister.[27]The accusations against Cambyses of committing incest are mentioned as part of his "blasphemous actions", which were designed to illustrate his "madness and vanity". These reports all derive from the same Egyptian source that was antagonistic towards Cambyses, and some of these allegations of "crimes", such as the killing of theApis bull,have been confirmed as false, which means that the report of Cambyses' supposed incestuous acts is questionable.[27]
Several of the Egyptiankingsmarried their sisters and had several children with them to continue the royal bloodline. For example,Tutankhamunmarried his half-sisterAnkhesenamun,and was himself the child of an incestuous union betweenAkhenatenand an unidentified sister-wife. Several scholars, such as Frier et al., state that sibling marriages were widespread among all classes in Egypt during the Graeco-Roman period. Numerouspapyriand the Roman census declarations attest to many husbands and wives being brother and sister, of the same father and mother.[29][30][31][32]However, it has also been argued that the available evidence does not support the view that such relations were common.[33][34][35]
The most famous of these relationships were in thePtolemaic royal family;Cleopatra VIIwas married to two of her younger brothers,Ptolemy XIIIandPtolemy XIV,whilst her mother and father,Cleopatra VandPtolemy XII,were also brother and sister.Arsinoe IIand her younger brotherPtolemy II Philadelphuswere the first in the family to participate in a full-sibling marriage, a departure from custom.[36]A union between full siblings was counternormative in Greek and Macedonian tradition, and prohibited by the laws of at least some cities.[36][37]
![](https://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Tutankhamun_and_his_wife_B._C._1330.jpg/220px-Tutankhamun_and_his_wife_B._C._1330.jpg)
The fable ofOedipus,with a theme of inadvertent incest between a mother and son, ends in disaster and shows ancient taboos against incest, since Oedipus blinds himself in disgust and shame after his incestuous actions. In the 'sequel' toOedipus,Antigone,his four children are also punished for their parents' incestuousness. Incest appears in the commonly accepted version of the birth ofAdonis,when his mother,Myrrha,has sex with her father,Cinyras,during a festival, disguised as aprostitute.
Inancient Greece,Spartan KingLeonidas I,hero of the legendaryBattle of Thermopylae,was married to hisnieceGorgo,daughter of his half-brotherCleomenes I.Greek law allowed marriage between a brother and sister if they had different mothers: for example, some accounts say thatElpinicewas for a time married to her half-brotherCimon.[38]
Incest is mentioned and condemned inVirgil'sAeneidBook VI:[39]hic thalamum invasit natae vetitosque hymenaeos– "This one invaded a daughter's room and a forbidden sex act".
![](https://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Yaxchil%C3%A1n_lintel.jpg/220px-Yaxchil%C3%A1n_lintel.jpg)
Roman civil lawprohibited marriages within four degrees of consanguinity[40]but had no degrees of affinity with regard to marriage. Roman civil laws prohibited any marriage between parents and children, either in the ascending or descending linead infinitum.[40]Adoption was considered the same as affinity in that an adoptive father could not marry anunemancipateddaughter or granddaughter even if the adoption had been dissolved.[40]Incestuous unions were discouraged and considerednefas(against the laws of gods and man) inancient Rome.In AD 295, incest was explicitly forbidden by an imperial edict, which divided the concept ofincestusinto two categories of unequal gravity: theincestus iuris gentium,which was applied to both Romans and non-Romans in the Empire, and theincestus iuris civilis,which concerned only Roman citizens. Therefore, for example, an Egyptian could marry an aunt, but a Roman could not. Despite the act of incest being unacceptable within the Roman Empire, Roman EmperorCaligulais rumored to have had sexual relationships with all three of his sisters (Julia Livilla,Drusilla,andAgrippina the Younger).[41]EmperorClaudius,after executing his previous wife, married his brother's daughter, Agrippina the Younger, and changed the law to allow an otherwise illegal union.[42]The law prohibiting marrying a sister's daughter remained.[43]The taboo against incest in ancient Rome is demonstrated by the fact that politicians would use charges of incest (often false charges) as insults and means of political disenfranchisement.
InNorse mythology,there are themes of brother–sister marriage, a prominent example being betweenNjörðrand hisunnamed sister(perhapsNerthus), parents ofFreyjaandFreyr.Lokiin turn also accuses Freyja and Freyr of having a sexual relationship.
Biblical references
[edit]The earliest Biblical reference to possible incest involves Cain. It was cited that he knew his wife and she conceived and bore Enoch.[44]A literalist reading of this passage indicates that, during this period, there was no other woman except Eve, or there was an unnamed sister, in which case Cain had an incestuous relationship with his mother or his sister.[44]According to theBook of Jubilees,Cainmarried his sisterAwan.[45][46]Later, in Genesis 20[47]of theHebrew Bible,thePatriarchAbrahammarried his half-sisterSarah.[48]Other references include the passage in 2 Samuel 13 whereAmnon,KingDavid's son, rapes his half-sisterTamar.[49]According toMichael D. Coogan,it would have been perfectly all right for Amnon to have married her, the Bible being inconsistent about prohibiting incest.[50]
In Genesis 19:30–38, while living in an isolated area after the destruction ofSodom and Gomorrah,Lot's two daughters conspire to inebriate and rape their father due to the lack of available partners to continue hisline of descent.Because of intoxication, Lot "perceived not" when his firstborn, and the following night his younger, daughter lay with him.[51]
Moses was also born of an incestuous marriage. Exodus 6[52]details how his father,Amram,was the nephew of his mother,Jochebed.[44]An account noted that the incestuous relations did not suffer the fate of childlessness, which was the punishment for such couples in Levitical law.[53]It stated, however, that the incest exposed Moses "to the peril of wild beasts, of the weather, of the water, and more."[53]
From the Middle Ages onward
[edit]Many European monarchs were related due to political marriages, such that many such marriages were between cousins of some degree, uncles and nieces, and so forth, and sometimes first cousins. This was especially true in theHabsburg,Hohenzollern,Savoy,andBourbonroyal houses. However, relations between siblings, which may have been tolerated in other cultures, were considered abhorrent. For example, the false accusation thatAnne Boleynand her brother,George Boleyn,had committed incest was one of the reasons given for both being executed in May 1536. Historians agree that the false accusation against Anne Boleyn and George Boleyn was trumped up in order to ensure the king could go on to marryJane Seymour.[54]Sects deemed heretical, such as theWaldensians,were accused of incest.[55]
Incestuous marriages were also seen in the royal houses of ancientJapanand Korea,[56]IncaPeru,Ancient Hawaii,and, at times, Central Africa,Mexico,andThailand.[57]Like the kings of ancient Egypt, theIncarulers married their sisters.Huayna Capac,for instance, was the son ofTopa Inca Yupanquiand the Inca's sister and wife.[58]
Half-sibling marriages were found in ancient Japan, such as the marriage ofEmperor Bidatsuand his half-sisterEmpress Suiko.[59]JapanesePrince Kinashi no Karuhad sexual relations with his full sister Princess Karu no Ōiratsume, although the action was regarded as foolish.[60]In order to prevent the influence of the other families, KoreanGoryeodynasty monarchGwangjongmarried his half-sister Daemok in the 10th century.[61]Marriage with a family member not related by blood was also regarded as contravening morality and was therefore incest. One example of this is the 14th centuryChunghye of Goryeo,who raped one of his deceasedfather's concubines,who was thus regarded to be his mother.[62]
In India, the largest proportion of women aged 13 to 49 who marry their close relatives are inTamil Nadu,thenAndhra Pradesh,Karnataka,andMaharashtra.While it is rare for uncle–niece marriages, it is more common inAndhra PradeshandTamil Nadu.[63][64]
Others
[edit]In some Southeast Asian cultures, stories of incest being common among certain ethnicities are sometimes told as expressions of contempt for those ethnicities.[65]
Marriages between younger brothers and their older sisters were common among the earlyUdege people.[66]
Prevalence and statistics
[edit]Incest between an adult and a person under theage of consentis considered a form ofchild sexual abuse[67][68]that has been shown to be one of the most extreme forms of childhood abuse; it often results in serious and long-termpsychological trauma,especially in the case of parental incest.[69]Its prevalence is difficult to generalize, but research has estimated 10–15% of the general population as having had at least one such sexual contact, with less than 2% involving intercourse or attempted intercourse.[70]Among women, research has yielded estimates as high as 20%.[69]
Father–daughterincest was for many years the most commonly reported and studied form of incest.[71][72]
Mother–sonincest is rarely reported. According to Catanzarite (1980), between 1965 and 1980 only a handful such cases were documented. Catanzarite attributes this to selection bias and the lack of physical evidence in such cases.[73]According to Etherington (1997), one of the reasons of the under-reporting of such cases is that men often found difficulty in defining their mother's behavior as abuse.[74]In a clinical study by Olson (1990), 30 men had been victims of incest; the mother was a perpetrator in 61.5 % of cases.[75]In a clinical study by Kelly et al. (2002), among the 67 sexually abused men, in 17 cases the perpetrators were their mothers.[76]
More recently, studies have suggested thatsibling incest,particularly older brothers having sexual relations with younger siblings, is the most common form of incest,[77][78][79][80][81][82][83][84][85]with some studies finding sibling incest occurring more frequently than other forms of incest.[86]Some studies suggest that adolescent perpetrators of sibling abuse choose younger victims, abuse victims over a lengthier period, use violence more frequently and severely than adult perpetrators, and that sibling abuse has a higher rate of penetrative acts than father or stepfather incest, with father and older brother incest resulting in greater reported distress than stepfather incest.[87][88][89]South Africa,[90]
Saudi Arabia, Sudan, Pakistan, and Nigeria are some of the countries with the most incest through consanguineous marriage.[91]
Types
[edit]Between adults and children
[edit]Sex between an adult family member and a child is usually considered a form of child sexual abuse,[92]also known aschild incestuous abuse,[93]and for many years has been the most reported form of incest. Father–daughter and stepfather–stepdaughter sex are the most commonly reported forms of adult–child incest, with most of the remaining involving a mother or stepmother.[94]Many studies found that stepfathers tend to be far more likely than biological fathers to engage in this form of incest. One study of adult women in San Francisco estimated that 17% of women were abused by stepfathers and 2% were abused by biological fathers.[95]Father–son incest is reported less often, but it is not known how close the frequency is to heterosexual incest because it is likely more under-reported.[96][97][98][99]The prevalence of incest between parents and their children is difficult to estimate due to secrecy and privacy.
In a 1999 news story, theBBCreported: "Close-knit family life in India masks an alarming amount of sexual abuse of children and teenage girls by family members, a new report suggests. Delhi organisationRAHIsaid 76% of respondents to its survey had been abused when they were children– 40% of those by a family member. "[100]
According to the National Center for Victims of Crime a large proportion ofrapecommitted in the United States is perpetrated by a family member:
Research indicates that 46% of children who are raped are victims of family members (Langan and Harlow, 1994). The majority of American rape victims (61%) are raped before the age of 18; furthermore, 29% of all rapes occurred when the victim was less than 11 years old. 11% of rape victims are raped by their fathers or stepfathers, and another 16% are raped by other relatives.[101]
A study of victims of father–daughter incest in the 1970s showed that there were "common features" within families before the occurrence of incest: estrangement between the mother and the daughter, extreme paternal dominance, and reassignment of some of the mother's traditional major family responsibility to the daughter. Oldest and only daughters were more likely to be the victims of incest. It was also stated that the incest experience was psychologically harmful to the woman in later life, frequently leading to low self-esteem, very unhealthy sexual activity, contempt for other women, and other emotional problems.[102]
Adults who as children were incestuously victimized by adults often suffer from lowself-esteem,difficulties in interpersonal relationships, andsexual dysfunction,and are at an extremely high risk of many mental disorders, includingdepression,anxiety disorders,phobic avoidance reactions,somatoform disorder,substance abuse,borderline personality disorder,andcomplex post-traumatic stress disorder.[69][103][104]
TheGoler claninNova Scotiais a specific instance in which child sexual abuse in the form of forced adult–child and sibling–sibling incest took place over at least three generations.[105]A number of Goler children were victims of sexual abuse at the hands of fathers, mothers, uncles, aunts, sisters, brothers, cousins, and each other. During interrogation by police, several of the adults openly admitted to engaging in many forms of sexual activity, up to and including full intercourse, multiple times with the children. Sixteen adults (both men and women) were charged with hundreds of allegations of incest and sexual abuse of children as young as five.[105]In July 2012, twelve children were removed from the'Colt' family(a pseudonym) inNew South Wales,Australia, after the discovery of four generations of incest.[106][107]Child protection workers and psychologists said interviews with the children indicated "a virtual sexual free-for-all".[108]
In Japan, there is a popular misconception that mother–son incestuous contact is common, due to the manner in which it is depicted in the press and popular media. According to Hideo Tokuoka, "when Americans think of incest, they think of fathers and daughters; in Japan one thinks of mothers and sons" due to the extensive media coverage of mother–son incest there.[109]Some Western researchers assumed that mother–son incest is common in Japan, but research into victimization statistics from police and health-care systems discredits this; it shows that the vast majority of sexual abuse in Japan, including incest, is perpetrated by men against young girls.[110]
While incest between adults and children generally involves the adult as the perpetrator of abuse, there are rare instances of sons sexually assaulting their mothers. These sons are typically mid-adolescent to young adult, and, unlike parent-initiated incest, the incidents involve some kind of physical force. Although the mothers may be accused of being seductive with their sons and inviting the sexual contact, this is contrary to evidence.[111][112]Such accusations can parallel other forms of rape, where, due tovictim blaming,a woman is accused of being at fault for the rape. In some cases, mother–son incest is best classified asacquaintance rapeof the mother by the adolescent son.[111][112]
Between children
[edit]Childhoodsibling–sibling incestis considered to be widespread but rarely reported.[94]Sibling–sibling incest becomeschild-on-child sexual abusewhen it occurs without consent, without equality, or as a result ofcoercion.In this form, it is believed to be the most common form of intrafamilial abuse.[113]The most commonly reported form of abusive sibling incest is abuse of a younger sibling by an older sibling.[94]A 2006 study showed a large portion of adults who experienced sibling incest abuse have "distorted" or "disturbed" beliefs (such as that the act was "normal" ) both about their own experience and the subject of sexual abuse in general.[114]
Sibling abusive incestis most prevalent in families where one or both parents are often absent or emotionally unavailable, with the abusive siblings using incest as a way to assert their power over a weaker sibling.[115]Absence of the father in particular has been found to be a significant element of most cases of sexual abuse of female children by a brother.[116]The damaging effects on both childhood development and adult symptoms resulting from brother–sister sexual abuse are similar to the effects of father–daughter, including substance abuse, depression, suicidality, and eating disorders.[116][117]
Between adults
[edit]Proponents of incest between consenting adults draw clear boundaries between the behavior of consenting adults on one hand and rape, child molestation, and abusive incest on the other.[118]However, even consensual relationships such as these are still legally classified as incest[119]and criminalized in many jurisdictions (although there arecertain exceptions). James Roffee, a senior lecturer in criminology atMonash Universityand former worker on legal responses to familial sexual activity in England and Wales, and Scotland[120]discussed how theEuropean Convention on Human Rightsdeems all familial sexual acts to be criminal, even if all parties give their full consent and are knowledgeable to all possible consequences.[121]He also argues that the use of particular language tools in the legislation manipulates the reader to deem all familial sexual activities as immoral and criminal, even if all parties are consenting adults.[122]
InSlate,William Saletandrew a legal connection between gay sex and incest between consenting adults.[123]As he described in his article, in 2003, US SenatorRick Santorumcommented on a pending US Supreme Court case involving sodomy laws (primarily as a matter ofconstitutional rightstoprivacyandequal protection under the law):
"If the Supreme Court says that you have the right to consensual sex within your home, then you have the right to bigamy, you have the right to polygamy, you have the right to incest, you have the right to adultery."[123]
Saletan argued that, legally and morally, there is essentially no difference between the two, and went on to support incest between consenting adults being covered by a legal right to privacy.[123]UCLAlaw professorEugene Volokhhas made similar arguments.[124]In a more recent article, Saletan said that incest is wrong because it introduces the possibility of irreparably damaging family units by introducing "a notoriously incendiary dynamic– sexual tension– into the mix ".[125]
Aunts, uncles, nieces or nephews
[edit]In theNetherlands,marrying one's nephew or niece is legal, but only with the explicit permission of the Dutch government, due to the possible risk ofgenetic defectsamong the offspring. Nephew-niece marriages predominantly occur among foreign immigrants. In November 2008, the Scientific Institute of the Christian Democratic Party (CDA) announced that it wanted a ban on marriages to nephews and nieces.[126]
Consensual sex between individuals aged 16 and older is always lawful in the Netherlands and Belgium, even among closely related family members. Sexual acts between an adult family member and a minor are illegal, though they are classified not as incest but as abuse of the authority such an adult has over a minor, comparable to that of a teacher, coach, or priest.[127]
InFlorida,consensual adult sexual intercourse with someone known to be one's aunt, uncle, niece, or nephew constitutes a felony of the third degree.[128]Other states also commonly prohibit marriages between such kin.[129]The legality of sex with a half-aunt or half-uncle varies state by state.[130]
In the United Kingdom, incest includes only sexual intercourse with a parent, grandparent, child, or sibling,[131]but the more recently introduced offense of "sex with an adult relative" extends as far as half-siblings, uncles, aunts, nephews, and nieces.[132]However, the term 'incest' remains widely used in popular culture to describe any form of sexual activity with a relative.
In Canada, marriage between uncles and nieces and between aunts and nephews is legal.[133]
Between adult siblings
[edit]One of the most public cases of adult sibling incest in the 2000s is the case ofPatrick Stübing and Susan Karolewski,a brother–sister couple from Germany. Because of violent behavior on the part of his father, Patrick was taken in at the age of 3 by foster parents, who adopted him later. At the age of 23 he learned about his biological parents, contacted his mother, and met her and his then 16-year-old sister Susan for the first time. The now-adult Patrick moved in with his birth family shortly thereafter. After their mother died suddenly six months later, the siblings became intimately close, and had their first child together in 2001. By 2004, they had had four children together: Eric, Sarah, Nancy, and Sofia. The public nature of their relationship, and the repeatedprosecutionsand jail time they have served as a result, have caused some in Germany to question whether incest between consenting adults should be punished at all. An article about them inDer Spiegelstates that the couple are happy together. According to court records, the first three children have mental and physical disabilities, and have been placed in foster care.[4]In April 2012, at theEuropean Court of Human Rights,Patrick Stübing lost his case that the conviction violated his right to a private and family life.[134][135]On 24 September 2014, theGerman Ethics Councilrecommended that the government abolish laws criminalizing incest between siblings, arguing that such bans impinge upon citizens.[136][137]
Some societies differentiate between full-sibling and half-sibling relations.[138][139]
Cousin relationships
[edit]![](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f2/Incest_World_Wide_Chart_%28Borysk5_orig_amended_by_Tyir86_with_title%2C_legend%2C_bkrd_color%29.png/220px-Incest_World_Wide_Chart_%28Borysk5_orig_amended_by_Tyir86_with_title%2C_legend%2C_bkrd_color%29.png)
Marriages and sexual relationships between first cousins are stigmatized as incest in some cultures, but tolerated in much of the world. Currently, 24US statesprohibit marriages between first cousins, and another seven permit them only under special circumstances.[140] The United Kingdom permits both marriage and sexual relations between first cousins.[141]
In some non-Western societies, marriages between close biological relatives account for 20–60% of all marriages.[142][143][144]
First- and second-cousin marriages are rare in Western Europe, North America, and Oceania, accounting for less than 1% of marriages, but reach 9% in South America, East Asia, and South Europe, and about 50% in regions of the Middle East, North Africa, and South Asia.[145]Communities such as the Dhond and theBhittaniof Pakistan clearly prefer marriages between cousins due to the belief they ensure purity of the descent line, provide intimate knowledge of the spouses, and ensure thatpatrimonywill not pass into the hands of "outsiders".[146]Cross-cousinmarriages are preferred among theYanomamiof Brazilian Amazonia, among many other tribal societies identified by anthropologists.
![](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/Cousin_marriage_map1.svg/220px-Cousin_marriage_map1.svg.png)
There are some cultures in Asia which stigmatize cousin marriage, in some instances even marriages between second cousins or more remotely related people. This is notably true in the culture ofKorea.In South Korea, before 1997, two people with the same last name and clan were prohibited from marrying. In light of this law being held unconstitutional, South Korea now only prohibits up to third cousins (seeArticle 809 of the Korean Civil Code).Hmongculture prohibits the marriage of anyone with the same last name– to do so would result in being shunned by the entire community, and they are usually stripped of their last name.[147]
In a review of 48 studies of children parented by cousins, the rate of birth defects was twice that of non-related couples: 4% for cousin couples as opposed to 2% for the general population.[148]
Defined through marriage
[edit]Some cultures include relatives by marriage in incest prohibitions; these relationships are calledaffinityrather thanconsanguinity.For example, the question of the legality and morality of a widower who wished to marry hisdeceased wife's sisterwas the subject of long and fierce debate in theUnited Kingdomin the 19th century, involving, among others,Matthew Boulton[149][150]andCharles La Trobe.The marriages were entered into in Scotland and Switzerland respectively, where they were legal. In medieval Europe,Lateran IVruled that standing as agodparentto a child also created a bond of affinity; which precluded legal marriage.[151]But in other societies, a deceased spouse's sibling was considered the ideal person to marry. The Hebrew Bible forbids a man from marrying his brother's widow with the exception that, if his brother dies childless, the man is required to marry his brother's widow so as to "raise up seed to him".[152]Some societies have long practicedsororal polygyny,a form ofpolygamyin which a man marries multiple wives who are sisters to each other (though not closely related to him).
In Islamic law, marriage among close blood relations like parents, stepparents, parents in-law, siblings, stepsiblings, the children of siblings, aunts, and uncles is forbidden, while first or second cousins may marry. Marrying the widow of a brother or the sister of a deceased or divorced wife is also allowed.
Inbreeding
[edit]Offspring of biologically related parents are subject to the possible impact of inbreeding. Such offspring have a higher possibility ofcongenital birth defects(seeCoefficient of relationship), because it increases the proportion of zygotes that arehomozygousfor deleteriousrecessive allelesthat produce such disorders[153](seeInbreeding depression). Because most suchallelesare rare in populations, it is unlikely that two unrelated marriage partners will both be heterozygous carriers. However, because close relativesshare a large fraction of their alleles,the probability that any such rare deleterious allele present in the common ancestor will be inherited from both related parents is increased dramatically with respect to non-inbred couples. Contrary to common belief, inbreeding does not in itself alter allele frequencies, but rather increases the relative proportion of homozygotes to heterozygotes. This has two contrary effects:[154]
- In the short term, because incestuous reproduction increaseszygosity,deleterious recessive alleles will express themselves more frequently, leading to increases inspontaneous abortionsof zygotes, perinatal deaths, and postnatal offspring with birth defects.
- In the long run, however, because of this increased exposure of deleterious recessive alleles tonatural selection,their frequency decreases more rapidly in inbred population, leading to a "healthier" population (with fewer deleterious recessive alleles).
The closer two persons are related, the higher the zygosity, and thus the more severe the biological costs of inbreeding. This fact likely explains why inbreeding between close relatives, such as siblings, is less common than inbreeding between cousins.[155]
There may also be other deleterious effects besides those caused by recessive diseases. Thus, similarimmune systemsmay be more vulnerable to infectious diseases (seeMajor histocompatibility complex and sexual selection).[156]
A 1994 study found a mean excess mortality with inbreeding among first cousins of 4.4%.[157]A 2008 study also found decreased lifespan among offspring of first cousins, but no difference between lifespans after the second cousin level.[158]Children of parent–child or sibling–sibling unions are at increased risk compared to cousin–cousin unions. Studies suggest that 20–36% of these children will die or have major disability due to the inbreeding.[9]A study of 29 offspring resulting from brother–sister or father–daughter incest found that 20 had congenital abnormalities, including four directly attributable to autosomal recessive alleles.[159]
Laws
[edit]Laws regarding sexual activity between close relatives vary considerably between jurisdictions, and depend on the type of sexual activity and the nature of the family relationship of the parties involved, as well as the age and sex of the parties. Prohibition of incest laws may extend to restrictions on marriage rights, which also vary between jurisdictions. Most jurisdictions prohibit parent–child and sibling marriages, while others also prohibit first-cousin and uncle–niece and aunt–nephew marriages. In most places, incest is illegal, regardless of the ages of the two partners. In other countries, incestuous relationships between consenting adults (with the age varying by location) are permitted, including in theNetherlands,France,Slovenia,andSpain.Swedenis the only country that allows marriage between half-siblings, and they must seek government counseling before marriage.[160]
While the legality of consensual incest varies by country, sexual assault committed against a relative is seen as a very serious crime. In some legal systems, the fact of a perpetrator being a close relative to the victim constitutes anaggravating circumstancein the case of sexual crimes such asrapeandsexual conduct with a minor– this is the case inRomania.[161]
Religious and philosophical views
[edit]Jewish
[edit]According to theTorah,per Leviticus 18,[162]"the children of Israel"– Israelite men and women alike– are forbidden from sexual relations between people who are "near of kin" (verse 6), who are defined as:
- Children and their mothers (verse 7);
- Siblings and half-siblings (verses 9 and 11). Relationships between these are particularly singled out for a curse inDeuteronomy 27,and they are of the only two kinds of incestuous relationship that are among the particularly singled-out relationships– with the other particularly singled-out relationships being ones of non-incestuous family betrayal (cf. verse 20) and bestiality (cf. verse 21);
- Grandparents and grandchildren (verse 10);
- Aunts and nephews, uncles and nieces, etc. (verses 12–14).[163]Relationships between these are the second kind of relationships that are particularly singled out for a curse inDeuteronomy 27,and the explicit examples of children-in-law and mothers-in-law (verse 23) serve to remind the Israelites that the parents-in-law are also (or at least should also be) the children-in-law's aunts and uncles:[164]
And Moses commanded the children of Israel according to the word of the LORD, saying: 'The tribe of the sons of Joseph speaketh right. This is the thing which the LORD hath commanded concerning the daughters ofZelophehad,saying: Let them be married to whom they think best; only into the family of the tribe of their father shall they be married. So shall no inheritance of the children of Israel remove from tribe to tribe; for the children of Israel shall cleave every one to the inheritance of the tribe of his fathers. And every daughter, that possesseth an inheritance in any tribe of the children of Israel, shall be wife unto one of the family of the tribe of her father, that the children of Israel may possess every man the inheritance of his fathers. So shall no inheritance remove from one tribe to another tribe; for the tribes of the children of Israel shall cleave each one to its own inheritance.' Even as the LORD commanded Moses, so did the daughters of Zelophehad. For Mahlah, Tirzah, and Hoglah, and Milcah, and Noah, the daughters of Zelophehad, were married unto their father's brothers' sons.[165]
Incestuous relationships, along with the other forbidden relationships that are mentioned in Leviticus 18, are considered so severe amongchillulim HaShem,acts which bring shame to the name of God, as to be punishable by death as specified inLeviticus 20.
In the 4th century BC, theSoferim(scribes) declared that there were relationships within which marriage constituted incest, in addition to those mentioned by the Torah. These additional relationships were termedseconds(Hebrew:sheniyyot), and included the wives of a man's grandfather and grandson.[166]The classical rabbis prohibited marriage between a man and any of thesesecondsof his, on the basis that doing so would act as asafeguardagainst infringing the biblical incest rules,[167]although there was inconclusive debate about exactly what the limits should be for the definition ofseconds.[168]
Marriages that are forbidden in the Torah (with the exception of uncle–niece marriages) were regarded by the rabbis of the Middle Ages as invalid– as if they had never occurred;[169]any children born to such a couple were regarded asbastards under Jewish law,[169]and the relatives of the spouse were not regarded as forbidden relations for a further marriage.[170]On the other hand, relationships that were prohibited due to qualifying assecondsand so forth were regarded as wicked, but still valid;[169]while such a couple may have been pressured to divorce, any children of the union were still seen as legitimate.[169]
Christian
[edit]The New Testament condemns relations between a man "and his father's wife" (1 Corinthians 5:1–5). It is inevitable for Bible literalists to accept that the first children of Adam and Eve would have been in incestuous relations as we regard it today. However, according to the Bible, God's law forbidding incest had not at that time been given to men, and was delivered to Moses after Adam and Eve were created. Protestant Christians who adopt the Old Testament as part of their rule of faith and practice make a distinction between the ceremonial law and the moral law given to Moses, with the demands of the ceremonial law being fulfilled by Christ's atoning death. Protestants view Leviticus 18:6–20 as part of the moral law and still applicable, thus condemning sexual/marriage relations between a man and his mother, sister, stepsister, stepmother (if a man has more than one wife it is forbidden for a son to have relations with or marry any of his father's wives), aunt, granddaughter, or his brother's wife. Leviticus 18 goes on to condemn relations between a man and the daughter of a woman he is having relations with, and the sister of a woman he has had sexual relations with while the first sister is still alive.
TheBook of Common Prayerof theAnglican Communionallows marriages up to and including first cousins.[171]
TheCatholic Churchregards incest as a sin against theSacrament of Matrimony.[172]For the Catholic Church, at the heart of the immorality of incest is the corruption and disordering of proper family relations. These disordered relationships take on a particularly grave and immoral character when it becomeschild sexual abuse.
As theCatechism of the Catholic Churchsays:
2388Incestdesignates intimate relations between relatives or in-laws within a degree that prohibits marriage between them. St. Paul stigmatizes this especially grave offense: 'It is actually reported that there is immorality among you...for a man is living with his father's wife....In the name of the Lord Jesus...you are to deliver this man to Satan for the destruction of the flesh....' Incest corrupts family relationships and marks a regression toward animality. 2389Connected to incest is any sexual abuse perpetrated by adults on children or adolescents entrusted to their care. The offense is compounded by the scandalous harm done to the physical and moral integrity of the young, who will remain scarred by it all their lives; and the violation of responsibility for their upbringing.[173]
Islamic
[edit]TheQurangives specific rules regarding incest, which prohibit a man from marrying or having sexual relationships with:
- his father's wife[174](his mother,[175]or stepmother,[175]his mother-in-law, a woman from whom he has nursed, even the children of this woman);[175]
- either parent's sister (aunt);[175]
- his sister, his half sister, a woman who has nursed from the same woman as he, his sister-in-law (wife's sister) while still married. Half relations are as sacred as full relations;[175]
- his niece (child of sibling);[175]
- his daughter, his stepdaughter (if the marriage to her mother wasconsummated), his daughter-in-law.[175]
Cousin marriage finds support in Islamic scriptures and iswidespread in the Middle East.[176]
Although Islam allows cousin marriage, there arehadithsattributed to Muhammad calling for distance from the marriage of relatives. However, Muslim scholars generally consider these hadiths unreliable.[177][178]
Zoroastrian
[edit]InAncient Persia,incest between cousins is a blessed virtue although in some sources incest is believed to be related to that of parent–child or brother–sister.[179]UnderZoroastrianism,royalty, clergy, and commoners practiced incest, though the extent in the lattermost class was unknown.[180][179]This tradition was calledXwedodah[181][182][183](Avestan:Xᵛaētuuadaθa,romanized:Xvaetvadatha).[180][184]The tradition was considered so sacred that the bodily fluids produced by an incestuous couple were thought to have curative powers.[179]For instance, theVendidadadvised corpse-bearers to purify themselves with a mixture of the urine of a married incestuous couple.[179]Friedrich Nietzsche,in his bookThe Birth of Tragedy,cited that among Zoroastrians a wise priest is born only by Xvaetvadatha.[185]
To what extent Xvaetvadatha was practiced inSasanianIran and before– especially outside the royal and noble families ( "dynastic incest" ) and, perhaps, the clergy– and whether practices ascribed to them can be assumed to be characteristic of the general population is not clear. There is a lack of genealogies and census material on the frequency of Xvaetvadatha.[186][187]Evidence fromDura-Europos,however, combined with that of the Jewish and Christian sources citing actual cases under the Sasanians, strengthens the evidence of the Zoroastrian texts. In the post-Sasanian Zoroastrian literature, Xvaetvadatha is said to refer to marriages between cousins instead, which have always been relatively common.[188]It has been observed that such incestuous acts received a great deal of glorification as a religious practice and, in addition to being condemned by foreigners (though the reliability of these accusations is questionable since accusations of incest were a common way of denigrating other groups),[189]were considered a great challenge by their own proponents, with accounts suggesting that four copulations was deemed a rare achievement worthy of eternal salvation. It has been suggested that because taking up incestuous relations was a great personal challenge, seemingly repugnant even to Zoroastrians of the time, it served as anhonest signalof commitment and devotion to religious ideals.[190][187]
Hindu
[edit]Rigvedaregards incest to be "evil".[191]Hinduismspeaks of incest in abhorrent terms. Hindus believe there are bothkarmicand practical bad effects of incest and thus practice strict rules of bothendogamyandexogamyin relation to the family tree (gotra) or bloodline (Pravara). Marriage within thegotra(swagotramarriage) is banned under the rule of exogamy in the traditional matrimonial system.[192]People within thegotraare regarded as kin, and marrying such a person would be thought of as incest. Marriage with paternal cousins (a form ofparallel-cousinrelationship) is strictly prohibited. Traditional Hindu laws of marriage suggest that, between a man and a woman who are about to marry, there should be no common ancestor (gotra) between the groom and the bride for up to 6 generations on the fathers' side of the groom and bride and up to 4 generations on the mothers' side of the groom and bride. Some orthodox Hindus might extend this limit to up to 8 generations on the father's side and 6 generations on the mother's side (for both the bride and groom).
Although generally marriages between persons having the samegotraare frowned upon,[193]how this is defined may vary regionally. Depending on culture andcasteof the population in the region, marriage may be restricted up to seven generations ofgotraof father, mother, and grandmother. In a few rural areas, marriage is banned within the same local community.[194]
Stoicism
[edit]The founder ofStoicism,Zeno of Citium,stated that incest was permissible inRepublic,as did the later prominent Stoic philosopherChrysippus.However, Zeno only advocates for incest under unique circumstances, such as procreating with one's ailing mother in order to beget "glorious" children, thus comforting her. Otherwise, incest is condemned as being contrary to Nature. Zeno further condemns incest from a moral and psychological perspective, considering it to be a sign ofPlato's tyrannical soul, defined as a soul that is governed by illimitable desire. He usesOedipusas a tragic example.[195]Nonetheless, later Stoic disciples by the 1st century BC downplayed the pro-incest advocacy, accusing Zeno of being "young and thoughtless" when he wroteRepublic.[196]
Other animals
[edit]![](https://upload.wikimedia.org/wikipedia/commons/thumb/9/93/Fruit_flies_mating.jpg/220px-Fruit_flies_mating.jpg)
Inbreeding avoidance is rare in non-human animals.[198]North Carolina State Universityfound thatbed bugs,in contrast to most other insects, tolerate incest and are able to genetically withstand the effects of inbreeding quite well.[199]
Many species ofmammals,including humanity's closestprimaterelatives, tend to avoid mating with close relatives, especially if there are alternative partners available.[200]However, some chimpanzees have been recorded attempting to mate with their mothers.[201]Male rats have been recorded engaging in mating with their sisters, but they tend to prefer non-related females over their sisters.[202]
Livestockbreeders often practice controlled breeding to eliminate undesirable characteristics within a population, which is also coupled with thecullingof what is considered unfit offspring, especially when trying to establish a new and desirable trait in the stock.
See also
[edit]- Accidental incest
- Adelphogamy
- Avunculate marriage
- Genetic distance
- Genetic diversity
- Genetic sexual attraction
- Incest between twins
- Incest taboo
- Incest in folklore and mythology
- Incest in literature
- List of coupled siblings
- Prohibited degree of kinship
- Proximity of blood
- Sibling relationship § Sibling marriage and incest
- Watta satta
- Westermarck effectwhich prevents most incest
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External links
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- Encyclopædia Britannica.Vol. 14 (11th ed.). 1911. .
- IncestatCurlie
- "Incest / Sexual Abuse of Children" by Patricia D. McClendon, MSSW