Because the Israeli kibbutz is innovative in collective ownership, production, consumption, and child care, and in part also because it is erroneously assumed to have once had a gender-egalitarian ideology and structure, it is taken to be a valid test case for many theories explaining or justifying gender inequality or gender equality. This article argues that the kibbutz cannot serve as a test case for theories that blame inequality on the family as such, on the exclusivity of infant rearing by (...) women, on the precultural differences between the sexes, or on compulsory heterosexuality for women. Kibbutz experience refutes theories that blame the inferior social status of women on material inequality, on private ownership of the means of production, or on the inferior ritual evaluation of women's activities. Kibbutz experience is indeed a unique test case for, but also a refutation of, theories that base gender equality on maximal participation of women in work in the public sphere or on the maximal socialization of housework and child care. Finally, kibbutz experience corroborates the theory that gender equality depends on equal control over surplus resources and, conspicuously so, the theory that in modern society, gender equality depends on the full abolition of the gender segregation of all social roles, especially work roles, whether performed in the private sphere or in the public sphere, whether paid for or unpaid. (shrink)

Much clinical and ethnographic evidence suggests that humans, like many other organisms, are selected to avoid close inbreeding because of the fitness costs of inbreeding depression. The proximate mechanism of human inbreeding avoidance seems to be precultural, and to involve the interaction of genetic predispositions and environmental conditions. As first suggested by E. Westermarck, and supported by evidence from Israeli kibbutzim, Chinese sim-pua marriage, and much convergent ethnographic and clinical evidence, humans negatively imprint on intimate associates during a critical period (...) of early childhood.There is also much evidence that, like other social animals, humans do not seek to maximize outbreeding, but rather to maintain an optimal balance between outbreeding and inbreeding.Closeinbreeding reduces fitness through inbreeding depression, butsomeinbreeding brings the benefits of nepotism. For simple, stateless, horticultural societies, the optimal balance seems to be achieved by a combination of precultural inbreeding avoidance of relatives with anr≤·25 and cultural rules of preferential marriage with kin withr≥·25. Adjustment of the coefficient of inbreeding to other ecological settings seems to be largely cultural. An interactive model of “culture in nature” is presented, in which culture is seen as coevolving with genes to produce the maxiniization of individual inclusive fitness. (shrink)

In this paper I suggest that play is a distinctive behavioural category whose adaptive significance calls for explanation. Play primarily affords juveniles practice toward the exercise of later skills. Its benefits exceed its costs when sufficient practice would otherwise be unlikely or unsafe, as is particularly true with physical skills and socially competitive ones. Manipulative play with objects is a byproduct of increased intelligence, specifically selected for only in a few advanced primates, notably the chimpanzee.The adaptiveness of play in pongid (...) evolution is traced through the probable changes in selective pressures that occurred in hominid evolution. It is argued that fantasy was an emergent property in hominids, made possible by symbolic intelligence and language, and serving to make play complex enough to continue to provide useful practice for increasingly complex later skills.The advent of organised instruction and education has meant that play's unplanned, intrinisic goal-setting could be replaced by extrinsic goal-setting in the systematic development of particular skills. However, the need to ensure adequate motivation has continued to give play educational value. In addition, its capacity to enhance innovative behaviour seems to be a residual function of play which has acquired a new cultural importance. (shrink)

Natural experiments wherein preferred marriage partners are co-reared play a central role in testing the Westermarck hypothesis. This paper reviews two such hitherto largely neglected experiments. The case of the Karo Batak is outlined in hopes that other scholars will procure additional information; the case of the Oneida community is examined in detail. Genealogical records reveal that, despite practicing communal child-rearing, marriages did take place within Oneida. However, when records are compared with first-person accounts, it becomes clear that, owing to (...) age- and gender-segregating practices, most endogamously marrying individuals probably did not share a history of extensive propinquity. (shrink)