Beyond the Taboo: Imagining Incest

This article provides an overview of anthropology's 150-year discussion of the incest taboo in light of the last 30 years of feminist and psychoanalytic discoveries about the incestuous abuse of children, it invites anthropologists to explore incest ethnographically and offers three suggested ways: one biosocial, a second social relational, and a third psychoanalytic, focusing on a connection between what psychologists call dissociation and what anthropologists call trance or possession. [Key words: incest taboo, childhood sexual abuse, dissociation, trance/possession, innate avoidance mechanism]     

Adopt a Daughter-in-Law, Marry a Sister: A Chinese Solution to the Problem of the Incest Taboo

In stressing the social advantages of the familial incest taboo, most explanations of the taboo ignore the fact that it makes marriage the enemy of the family. The stranger intruded by marriage often poses a threat to existing domestic relationships. The Chinese solution to this problem is to circumvent the taboo by adopting female children who are raised as wives for their foster parents' sons. The family choosing this form of marriage sacrifices prestige and dependable affinal ties, but by socializing their own daughters-in-law they preserve domestic harmony. The fact that many Chinese arrange marriages within the family as a means of preserving the family suggests that widely accepted explanations of the incest taboo exaggerate the dangers of incest and ignore the dangers of the taboo.     

Same-Sex Avoidance Relations and What They Reveal about Male Competition

Avoidance relations between male kin are a pervasive social phenomenon, yet the subject has received comparatively little treatment in the anthropological literature. When anthropologists have addressed it, they have usually done so indirectly, or put forward theories better suited to explaining other social phenomena. The most common explanations one comes across in the anthropological literature to account for avoidance relationships between male kin, or what I also describe as same-sex avoidance relations in the paper, are the incest taboo and Radcliffe-Brown's theory of respect. In contrast to these explanations, I propose to demonstrate that the reason male kin avoid each other in certain types of settings is not just to maintain a sense of authority and precedence as Radcliffe-Brown's theory implies, or to avoid contravening incest prohibitions, which as Robert Lowie pointed out long ago is incorrect. Rather, because closely related male kin should not compete with each other, as this would contravene the ideology of descent which demands loyalty to one's kin.     

Disappearance of the Incest Taboo: A Cross-Cultural Test of General Evolutionary Hypotheses

Employing a cross-cultural sample of 121 societies, this research tests and supports three hypotheses offered by Yehudi Cohen (1978) concerning the relationship between the general evolution of society and the extension of the incest taboo. Cohen generally proposes that the number of relatives included in the incest taboo will be reduced as societies become technologically and socially more complex. More specifically, Cohen identifies the development of trade institutions as eliminating the need for extended incest regulations. Furthermore, Cohen proposes that as the incest taboo contracts and becomes less important, violations of this taboo are treated less severely.     

Avoidance and prohibition of brother–sister sex in humans

Sex between full sibs is unusual in birds, mammals, and humans. These species likely possess an innate avoidance mechanism based on early proximity (i.e., the Westermarck hypothesis), and the rare occurrences may be attributable to error. Alternatively, an inclusive fitness argument shows that a low rate of sib mating may be an adaptation. The widespread occurrence of a prohibition against brother–sister sex in human societies is often invoked as evidence against an innate avoidance mechanism, since if the latter were to exist the former would be superfluous. However, given that punishing violators is costly, a prohibition is more likely to spread through an egalitarian society when the prohibited behavior is already avoided. I describe a model of the cultural dynamics of the sibling incest taboo which we have used to investigate this possibility. The predictions derived from this model are consistent with, and add rigor to, Westermarcks theory of the origin of the incest taboo.     

Causes and consequences of incest avoidance in the cooperatively breeding mole-rat, Cryptomys darlingi (Bathyergidae)

A number of social mole-rat species maintain a strong reproductive skew (only one breeding pair in the group) solely through incest avoidance. Incest avoidance probably evolved for one of two reasons, namely for actually maintaining a reproductive skew or, alternatively, to avoid high inbreeding depression. In the latter case a strong reproductive skew would result as a fortuitous by-product of the combination of a cloistral family life style of mole-rats and incest avoidance. We undertook breeding experiments in which the fertility of pairs of unrelated individuals were compared with that of pairs of double first cousins. Inbreeding depression was remarkably high and an accompanying model suggests that it may be sufficient to support the idea that strong incest avoidance evolved primarily to eliminate the costs of inbreeding and subsequently facilitated the evolution of reproductive skew.     

Childhood Association and Sexual Attraction: A Further Test of the Westermarck Hypothesis

A preliminary study of household registration records from Taiwan supports Edward Westermarck's contention that intimate childhood association promotes sexual aversion. Women who are forced to marry a childhood associate bear fewer children than those who marry a stranger. They are also more likely to leave their husband by divorce or avoid him in favor of other men. This evidence suggests that the incest taboo does not prohibit what men's feelings incline them to do, as Westermarck's critics argue, but that it is instead an expression of these feelings, socially unnecessary but psychologically inevitable. [incest taboo, law, China, Taiwan]     

The evolutionary significance of incest rules

Evolutionary theory predicts that humans should avoid incest because the behavior depresses individual fitness through production of defective offspring. Selection for avoidance of close-kin mating has resulted in a developmental mechanism that promotes voluntary incest avoidance. If avoided, why are social rules constructed in most cultures to regulate incest? The suggestion in this article is that incest do not regulate close-kin mating, but instead regulate inbreeding between more distant kin and sexual relations between nonkin. Inbreeding (e.g., cousin marriage) is hypothesized to be regulated because if it occurs, it can concentrate wealth and power within families threatening the powerful positions of rulers in the society. The hypothesis was supported using a worldwide sample of 129 societies, whereas two other alternative hypotheses (one dealing with coadapted genomes, and the other with sexual reproduction and host/ parasite coevolution), were not.     

Does evolutionary biology contribute to ethics?

Human propensities that are the products of Darwinian evolution may combine to generate a form of social behavior that is not itself a direct result of such pressure. This possibility may provide a satisfying explanation for the origin of socially transmitted rules such as the incest taboo. Similarly, the regulatory processes of development that generated adaptations to the environment in the circumstances in which they evolved can produce surprising and sometimes maladaptive consequences for the individual in modern conditions. These combinatorial aspects of social and developmental dynamics leave a subtle but not wholly uninteresting role for evolutionary biology in explaining the origins of human morality.     

SENSUAL ATTACHMENT AND INCEST AVOIDANCE IN HUMAN EVOLUTION AND CHILD DEVELOPMENT

The authors take issue with the critique of psychoanalysis and the depiction of human sexuality and incest avoidance in evolutionary psychology. Drawing on human neurobiology and evolutionary anthropology, they show that human beings have an evolved disposition toward pair-bonding and evolved capacities for self-regulation of sexual and aggressive impulses. The realization that these characteristics are not only important but also interrelated leads to a reassessment of the Oedipus complex, a new model of incest avoidance in humans, and a fresh perspective on the relation between reproductive behaviour and environmental conditions.     

Brother-sister and parent-child marriage outside royal families in ancient egypt and iran: A challenge to the sociobiological view of incest avoidance?

Copious and unequivocal evidence of legally condoned and socially favored brother-sister and parent-child marriage among common people from Roman Egypt (first to third centuries, A.D.) and Zoroastrian Iran (fifth century, B.C. to 11th century, A.D.) can be taken to pose a challenge to the sociobiological case for universal evolved incest avoidance within the nuclear family, triggered by early childhood proximity (the Westermarck effect). Official census documents from Roman Egypt show a high incidence of full sibling unions with relatively small age gaps between the spouses and no indication of reduced marital fertility, sexual aversion, or increased infant and child mortality. Zoroastrian religious tracts actively encourage nuclear family incest and extol its meritorious nature and supernatural benefits. A schematic assessment of the likely extent of inbreeding depression in such families under conditions of very high mortality through other causes makes reproduction at replacement level seem difficult to accomplish. But given the lack of information on the frequency of deleterious recessive genes in these populations, this reconstruction is fraught with uncertainty; pertinent ancient evidence is suggestive of some incidence of inbreeding depression but remains inconclusive. Aversion and revulsion between incestuous spouses proves a similarly elusive issue. Although these cases from antiquity do not clearly contradict the view of incest avoidance as an evolved mechanism that engenders sexual indifference and normally translates into corresponding cultural norms, they demonstrate the need for a more comprehensive consideration of the available historical record in the testing of evolutionary rules.     

When brother–sister marriage becomes incest

This essay traces how marriages between brothers and sisters in the Lao and Thai royal families came to be conceptualised as ‘incest’ and therefore taboo over the first half of the twentieth century. This change was associated with changing royal marriage strategies and changing ideas about the nature of royal persons. The article concludes with some broader theoretical reflections on incest.     

Evidence for frequent incest in a cooperatively breeding mammal

As breeding between relatives often results in inbreeding depression, inbreeding avoidance is widespread in the animal kingdom. However, inbreeding avoidance may entail fitness costs. For example, dispersal away from relatives may reduce survival. How these conflicting selection pressures are resolved is challenging to investigate, but theoretical models predict that inbreeding should occur frequently in some systems. Despite this, few studies have found evidence of regular incest in mammals, even in social species where relatives are spatio-temporally clustered and opportunities for inbreeding frequently arise. We used genetic parentage assignments together with relatedness data to quantify inbreeding rates in a wild population of banded mongooses, a cooperatively breeding carnivore. We show that females regularly conceive to close relatives, including fathers and brothers. We suggest that the costs of inbreeding avoidance may sometimes outweigh the benefits, even in cooperatively breeding species where strong within-group incest avoidance is considered to be the norm.     

FBD Marriage: Further Support for the Westermarck Hypothesis of the Incest Taboo?

In the past decade, several reports, including data from Taiwan on the sim-pua form of marriage, have provided evidence for the Westermarck Hypothesis, a heretofore unpopular explanation of the incest taboo. This theory states that intimate childhood association breeds sexual disinterest. A preliminary study of FBD marriage in Lebanon reveals similar support for Westermarck's theory. The Lebanese patrilateral parallel cousin marriages examined produced significantly fewer children and more divorces than nonpaternal first cousin unions. Given the quite disparate cultures from which this evidence comes, serious reconsideration of Westermarck's Hypothesis is suggested. [incest taboo, FBD marriage, Lebanon, Middle Eastern sexuality]     

Kinship Between Judith Butler and Anthropology? A Review Essay

This essay critically evaluates Judith Butler's recent writings on kinship. In this work, Butler challenges the universalist assumptions of psychoanalysis, hoping to lay the analytical groundwork for imagining new forms of familial relationship. Butler examines the way that anthropology and psychoanalysis have constructed the incest taboo as necessitating heteronormative forms of kinship. Butler's critique of kinship, which draws on her theories of subjection, belies her own attachment to a vision of social life occupied primarily by normative institutions, in particular the state. I suggest that new forms of kinship must be understood on their own terms, whether or not they are accorded legitimacy in law or accepted by psychoanalysis. Anthropology's ethnographic practice can emendate an account of subjection and recognition that obsessively looks to institutions and norms even as it criticizes them.     

Reproductive roles in the cooperatively breeding acorn woodpecker: incest avoidance versus reproductive competition

Incest is rare in the cooperatively breeding acorn woodpecker (Melanerpes formicivorus) despite a polygynandrous mating system in which nearly all group members are close relatives. Here we test the relative importance of avoiding matings between close relatives (incest avoidance) and within-sex competition for breeding opportunities (reproductive competition) in determining the mating system of acorn woodpeckers by examining how reproductive roles change following breeding vacancies. In 83% of cases in which helpers of the same sex were present in the group, reproductive vacancies were resolved when new unrelated immigrants filled the vacancy to the exclusion of resident same-sex helpers, who generally emigrated or did not breed while they remained in the group. Helpers of the opposite sex, especially when male, were significantly more likely to remain in their natal group and in about half the cases inherited and bred following reproductive vacancies. This result was not explainable by reproductive competition, since the number of immigrants was often less than or equal to the number of same-sex helpers in the group. Apparent incest resulted in 5% of cases. The time required to resolve reproductive vacancies was significantly longer for groups with helpers of the same sex as the vacancy. These results confirm that both incest avoidance and reproductive competition are important factors determining reproductive roles within groups of this highly social species.     

Infanticide among free-ranging langurs (Presbytis entellus) at jodhpur (Rajasthan/India): Recent observations and a reconsideration of hypotheses

Considerable disagreement characterizes the debate concerning frequency, causation, and function of infanticide in connection with adult male replacements in bisexual one-male troops of hanuman langurs (Presbytis entellus). Detailed observations are presented about two noninfanticidal and three infanticidal male changes including six eye-witness and five presumed cases of infanticide within three langur troops during a long-term study at Jodhpur, Rajasthan, India. The results do not support any explanatory hypotheses focussing on social crowding, regulation of population density, social stress, sexual frustration, incest avoidance, or social bonding, but are in general though not total agreement with the reproductive advantage hypothesis: mainly unrelated infants were killed (one possible exception), the infanticidal male generally sired the subsequent offspring (one exception), and the mean interbirth interval subsequent to infanticide is by 2.1 months shortened. Likewise, several cases of stress induced abortions occurred. It is demonstrated that postconception estrous behaviour is by no means a female counterstrategy to infanticide in order to confuse males concerning the issue of paternity, since an infanticidal male did not spare the subsequent offspring of mothers who copulated with him during pregnancy and pregnant females did not discriminate between fathers and non-fathers.