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ffinity consanguinity marriage incest taboo endogamy exogamy minor moiety monogamy polygyny polygamy concubinage polyandry bride price bride service dowry parallel cross cousins cousin marriage levirate sororate posthumous marriage joking relationship clan cohabitation fictive milk nurture kinship descent cognatic bilateral matrilateral lineal collateral house society avunculate linealities ambilineality unilineality matrilineality patrilineality household forms and residence extended matrifocal matrilocal neolocal nuclear patrilocal terminology kinship terminology classificatory terminologies by group iroquois crow omaha inuit eskimo hawaiian sudanese dravidian debated case studies australian aboriginal burmese chinese philippine polyandry in tibet in india feminist chambri mosuo sexuality coming of age in samoa major theorists diane bell tom boellstorff jack goody w d hamilton joseph henrich gilbert herdt don kulick roger lancaster louise lamphere eleanor leacock claude lévi strauss bronisław malinowski margaret mead henrietta moore lewis h morgan stephen o murray michelle rosaldo gayle rubin david m schneider heinrich schurtz marilyn strathern related articles alliance theory matrilineal matrilocal societies feminist anthropology sex and repression in savage society social bonding and nurture kinship the traffic in women social anthropology cultural anthropology v t e an incest taboo is any cultural rule or norm that prohibits sexual relations between certain members of the same family mainly between individuals related by blood all known human cultures have norms that exclude certain close relatives from those considered suitable or permissible sexual or marriage partners making such relationships taboo however different norms exist among cultures as to which blood relations are permissible as sexual partners and which are not sexual relations between related persons which are subject to the taboo are called incestuous relationships some cultures proscribe sexual relations between clan members even when no traceable biological relationship exists while members of other clans are permissible irrespective of the existence of a biological relationship in many cultures certain types of cousin relations are preferred as sexual and marital partners whereas in others these are taboo some cultures permit sexual and marital relations between aunts uncles and nephews nieces in some instances brother sister marriages have been practised by the elites with some regularity parent child and sibling sibling unions are almost universally taboo 1 origin edit debate about the origin of the incest taboo has often been framed as a question of whether it is based in nature or nurture one explanation sees the incest taboo as a cultural implementation of a biologically evolved preference for sexual partners with whom one is unlikely to share genes since inbreeding may have detrimental outcomes the most widely held hypothesis proposes that the westermarck effect discourages adults from engaging in sexual relations with individuals with whom they grew up the existence of the westermarck effect has achieved some empirical support 2 another school argues that the incest prohibition is a cultural construct which arises as a side effect of a general human preference for group exogamy which arises because intermarriage between groups construct valuable alliances that improve the ability for both groups to thrive according to this view the incest taboo is not necessarily universal but is likely to arise and become more strict under cultural circumstances that favour exogamy over endogamy and likely to become more lax under circumstances that favor endogamy this hypothesis has also achieved some empirical support citation needed limits to biological evolution of taboo edit while it is theoretically possible that natural selection may under certain genetic circumstances select for individuals that instinctively avoid mating with close relatives incest will still exist in the gene pool because even genetically weakened inbred individuals are better watchposts against predators than none at all and weak individuals are useful for the stronger individuals in the group as looking out for predators without being able to seriously compete with the stronger individuals 3 4 dubious discuss 5 6 research edit this section needs more citations please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed february 2016 learn how and when to remove this message modern anthropology developed at a time when a great many human societies were illiterate and much of the research on incest taboos has taken place in societies without legal codes and therefore without written laws concerning marriage and incest nevertheless anthropologists have found that the institution of marriage and rules concerning appropriate and inappropriate sexual behavior exist in every society 7 the following excerpt from notes and queries on anthropology 1951 a well established field manual for ethnographic research illustrates the scope of ethnographic investigation into the matter incest is sexual intercourse between individuals related in certain prohibited degrees of kinship in every society there are rules prohibiting incestuous unions both as to sexual intercourse and recognized marriage the two prohibitions do not necessarily coincide there is no uniformity as to which degrees are involved in the prohibitions the rules regulating incest must be investigated in every society by means of the genealogical method the prohibition may be so narrow as to include only one type of parent child relationship though this is very rare or those within the elementary family or so wide as to include all with whom genealogical or classificatory kinship can be traced the more usual practice is that unions with certain relatives only are considered incestuous the relationships being regulated by the type of descent emphasized in some societies unions with certain persons related by affinity are also considered incestuous what penalties fall on a the individuals concerned b the community as a whole are such penalties enforced by authority or are they believed to ensue automatically by the action of a supernatural force is there any correlation between the severity of the penalty and the nearness of the blood tie of the partners in guilt should children be born as the result of incestuous unions how are they treated are there any methods ritual or legal by which persons who fall within the prohibited degrees and wish to marry can break the relationship and become free to marry 8 these theories anthropologists are generally concerned solely with brother sister incest and are not claiming that all sexual relations among family members are taboo or even necessarily considered incestuous by that society 2 these theories are further complicated by the fact that in many societies people related to one another in different ways and sometimes distantly are classified together as siblings and others who are just as closely related genetically are not considered family members the definition restricts itself to sexual intercourse this does not mean that other forms of sexual contact do not occur or are proscribed or prescribed for example in some inuit societies in the arctic and traditionally in bali mothers would routinely stroke the penises of their infant sons such behavior was considered no more sexual than breastfeeding 9 10 in these theories anthropologists are primarily concerned with marriage rules and not actual sexual behavior in short anthropologists were not studying incest per se they were asking informants what they meant by incest and what the consequences of incest were in order to map out social relationships within the community citation needed this excerpt also suggests that the relationship between sexual and marriage practices is complex and that societies distinguish between different sorts of prohibitions in other words although an individual may be prohibited from marrying or having sexual relations with many people different sexual relations may be prohibited for different reasons and with different penalties for example trobriand islanders prohibit both sexual relations between a woman and her brother 11 and between a woman and her father 12 but they describe these prohibitions in very different ways relations between a woman and her brother fall within the category of forbidden relations among members of the same clan relations between a woman and her father do not 12 this is because the trobrianders are matrilineal children belong to the clan of their mother and not of their father thus sexual relations between a man and his mother s sister and mother s sister s daughter are also considered incestuous but relations between a man and his father s sister are not 13 a man and his father s sister will often have a flirtatious relationship and far from being taboo trobriand society encourages a man and his father s sister or the daughter of his father s sister to have sexual relations or marry 14 instinctual and genetic explanations edit see also inbreeding depression an explanation for the taboo is that it is due to an instinctual inborn aversion that would lower the adverse genetic effects of inbreeding such as a higher incidence of congenital birth defects since the rise of modern genetics belief in this theory has grown 15 16 17 18 failed verification birth defects and inbreeding edit the increase in frequency of birth defects often attributed to inbreeding results directly from an increase in the frequency of homozygous alleles inherited by the offspring of inbred couples 19 this leads to an increase in homozygous allele frequency within a population and results in diverging effects should a child inherit the version of homozygous alleles responsible for a birth defect from its parents the birth defect will be expressed on the other hand should the child inherit the version of homozygous alleles not responsible for a birth defect it would actually decrease the ratio of the allele version responsible for the birth defect in that population the overall consequences of these diverging effects depends in part on the size of the population in small populations as long as children born with inheritable birth defects die or are killed before they reproduce the ultimate effect of inbreeding will be to decrease the frequency of defective genes in the population over time the gene pool will be healthier however in larger populations it is more likely that large numbers of carriers will survive and mate leading to more constant rates of birth defects 20 besides recessive genes there are also other reasons why inbreeding may be harmful such as a narrow range of certain immune systems genes in a population increasing vulnerability to infectious diseases see major histocompatibility complex and sexual selection the biological costs of incest also depend largely on the degree of genetic proximity between the two relatives engaging in incest this fact may explain why the cultural taboo generally includes prohibitions against sex between close relatives but less often includes prohibitions against sex between more distal relatives 21 children born of close relatives have decreased survival 17 18 many mammal species including humanity s closest primate relatives avoid incest 2 westermarck effect edit main article westermarck effect the westermarck effect first proposed by edvard westermarck in 1891 is the theory that children reared together regardless of biological relationship form a sentimental attachment that is by its nature non erotic 22 melford spiro argued that his observations that unrelated children reared together on israeli kibbutzim nevertheless avoided one another as sexual partners confirmed the westermarck effect 23 joseph shepher in a study examined the second generation in a kibbutz and found no marriages and no sexual activity between the adolescents in the same peer group this was not enforced but voluntary looking at the second generation adults in all kibbutzim out of a total of 2769 marriages none were between those of the same peer group 24 however according to a book review by john hartung of a book by shepher out of 2516 marriages documented in israel 200 were between couples reared in the same kibbutz these marriages occurred after young adults reared on kibbutzim had served in the military and encountered tens of thousands of other potential mates and 200 marriages is higher than what would be expected by chance of these 200 marriages five were between men and women who had been reared together for the first six years of their lives 25 a study in taiwan of marriages where the future bride is adopted in the groom s family as an infant or small child found that these marriages have higher infidelity and divorce and lower fertility than ordinary marriages it has been argued that this observation is consistent with the westermarck effect 26 third parties objections edit another approach is looking at moral objections to third party incest this increases the longer a child has grown up together with another child of the opposite sex this occurs even if the other child is genetically unrelated 18 humans have been argued to have a special kin detection system that besides the incest taboo also regulates a tendency towards altruism towards kin 27 counter arguments edit one objection against an instinctive and genetic basis for the incest taboo is that incest does occur 28 29 30 anthropologists have also argued that the social construct incest and the incest taboo is not the same thing as the biological phenomenon of inbreeding for example there is equal genetic relation between a man and the daughter of his father s sister and between a man and the daughter of his mother s sister such that biologists would consider mating incestuous in both instances but trobrianders consider mating incestuous in one case and not in the other anthropologists have documented a great number of societies where marriages between some first cousins are prohibited as incestuous while marriages between other first cousins are encouraged therefore it is argued that the prohibition against incestuous relations in most societies is not based on or motivated by concerns over biological closeness 31 other studies on cousin marriages have found support for a biological basis for the taboo 32 33 34 also current supporters of genetic influences on behavior do not argue that genes determine behavior absolutely but that genes may create predispositions that are affected in various ways by the environment including culture 35 steve stewart williams argues against the view that incest taboo is a western phenomenon arguing that while brother sister marriage was reported in a diverse range of cultures such egyptian incan and hawaiian cultures it was not...
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