This paper reviews and synthesizes emerging multi-disciplinary evidence toward understanding the development of social and political organization in the Last Glacial. Evidence for the prevalence and scope of political egalitarianism is reviewed and the biological, social, and environmental influences on this mode of human organization are further explored. Viewing social and political organization in the Last Glacial in a much wider, multi-disciplinary context provides the footing for coherent theory building and hypothesis testing by which to further explore human political systems. (...) We aim to overcome the claim that our ancestors’ form of social organization is untestable, as well as counter a degree of exaggeration regarding possibilities for sedentism, population densities, and hierarchical structures prior to the Holocene with crucial advances from disparate disciplines. (shrink)

This work tests two conflicting views about double standards: whether they reflect evolved sex differences in behavior or a manipulative morality serving male interests. Two questionnaires on jealous reactions to mild (flirting) and serious (cheating) sexual transgressions were randomly assigned to 172 young women and men. One questionnaire assessed standards for appropriate behavior and perceptions of how young women and men usually react. The second asked people to report how they had reacted or, if naive, how they would react. The (...) questions concerned anger at and blame of partner and rival and the self-oriented responses of loss of self-esteem, feelings of hurt, and fear of losing the partner. As predicted by the idea of manipulative morality, both sexes advanced sets of double standards that serve the interests of their own sex at the expense of the opposite sex. Much of the data contradict the idea of a match between double standards and evolved sex differences. First, subjects who set self-serving double standards did not perceive gender differences in jealous reactions. Second, there were few gender differences in judgments regarding jealous responses. Third, in contrast with the familiar double standard, women were more aggressively reactive to a flirting rival than men. Fourth, self-reports of the strength of aggressive jealous reactions suggest that women’s behavior is stronger than the prescriptions for it. These data suggest that double standards represent a communication strategy which assists men’s control of women. The data on jealous reactions were interpreted in terms of the degree of threat to fitness posed by infidelity in different situations. (shrink)

Sociobiologists and feminists agree that men in patriarchal social systems seek to control females, but sociobiologists go further, using Darwin’s theory of sexual selection and Trivers’s ideas on parental investment to explain why males should attempt to control female sexuality. From this perspective, the stage for the development under some conditions of patriarchal social systems was set over the course of primate evolution. Sexual selection encompasses both competition between males and female choice. But in applying this theory to our “lower (...) origins” (prehominid ancestors), Darwin assumed that choices were made by essentially “coy” females. I argue here that female solicitation of multiple males (either simultaneously or sequentially, depending on the breeding system) characterized prehominid females; this prehominid legacy of cyclical sexual assertiveness, itself possibly a female counter-strategy to male efforts to control the timing of female reproduction, generated further male counter-strategies. This dialectic had important implications for emerging hominid mating systems, human evolution, and the development of patriarchal arrangements in some human societies. For hominid males who will invest in offspring, there would be powerful selection for emotions, behaviors, and customs that ensure them certainty of paternity. The sexual modesty that so struck Darwin can be explained as a recent evolved or learned (perhaps both) adaptation in women to avoid penalties imposed by patrilines on daughters and mates who failed to conform to the patriline’s prevailing norms for their sex. Other supposedly innate universals, such as female preferences for wealthy husbands, are also likely to be facultative accommodations by women to constraints set up when patrilines monopolized resources needed by females to survive and reproduce, and passed on intergenerational control of these resources preferentially to sons. (shrink)

: There has been a marked expansion in our human knowledge in recent decades, and much of this new information about ourselves and our world has yet to be integrated into our human self-image. I maintain that understanding how we fit within the spectrum of lifeforms as the primates that we are will enable us to take a more active role in choosing ecologically responsible behavior and will allow us to address more effectively our major problems of overpopulation, overconsumption, and (...) militarism. (shrink)

Today the modern Darwinian theory of evolution is the unifying theory within the biological sciences. A consideration of its implications for feminism is, however, impossible without a critical evaluation of its history of male bias. The aim of this article is therefore threefold. First, to explain what sexual selection entails. Second, to discuss male bias in and feminist reactions to Darwinian theory in general and sexual selection theory in particular. Third, to demonstrate that it would be a loss for feminism (...) to keep rejecting an evolutionary framework if we want to understand the roots of gender difference. This article is informed by a Darwinian feminist perspective. (shrink)

Men’s hunting has dominated the discourse on energy capture and flow in the past decade or so. We turn to women’s roles as critical to household formation, pair-bonding, and intergenerational bonds. Their pivotal contributions in food processing and distribution likely promoted kinship, both genetic and affinal, and appear to be the foundation from which households evolved. With conscious recognition of household social units, variable cultural constructions of human kinship systems that were sensitive to environmental and technological conditions could emerge. Kinship (...) dramatically altered the organization of resource access for our species, creating what we term “kinship ecologies.” We present simple mathematical models to show how hunting leads to dependence on women’s contributions, bonds men to women, and bonds generations together. Kinship, as it organized transfers of food and labor energy centered on women, also became integrated with the biological evolution of human reproduction and life history. (shrink)

Males and females of a number of animal species divide labor and provide jointly for offspring. Males may provide food, for example, while females protect defenseless young. This exchange is unlikely, however, unless a prior partnership has been established in which a female practices fidelity in exchange for a male’s provisioning activity. The formation of the trading partnership is itself an exchange, and economic theory can help explain when and why there are mutual gains from trading fidelity for resources. Environmental (...) factors determine the potential gains from trade while evolved psychological mechanisms influence the extent to which gains are realized. (shrink)

In this paper I use measures of childhood growth to assess from both an evolutionary theoretical and an applied public health perspective the impact of polygyny on maternal-child welfare among the Datoga pastoralists of Tanzania. I report that the growth and body composition of children varies in such a way as to suggest that polygyny is not generally beneficial to women in terms of offspring quality. Cross-sectional analysis of covariance by maternal marriage status revealed that children of first and second (...) wives in polygynous marriages grow relatively poorly, that this is correlated with maternal physical status, and that the pattern is not modified by household wealth. I discuss how the dynamics of sexual conflicts operating during the formation and maintenance of marriages may be important factors in the etiology of poor child growth in this population, leading to complex patterns of variation in anthropometric indicators of both women and children. The theoretical conclusion is that improved evolutionary models of polygyny should be designed to examine the potential for adaptive tradeoffs between the currencies of offspring quality and quantity for all types of parents in a polygynous population. The practical conclusion is that a better understanding of the relationships between marriage practices and health outcomes would assist in the development of culturally appropriate health and nutrition interventions. (shrink)

By modifying the body in meaningful ways, human beings establish their identity and social status. Lip plugs, ear plugs, penis sheaths, cosmetics, ornaments, scarification, body piercings, and genital modifications encode and transmit messages about age, sex, social status, health, and attractiveness from one individual to another. Through sociocultural sexual selection, male genital modification plays an important role as a sociosexual signal in both male competition and female mate choice. The reliability of the signal correlates with the cost of acquiring the (...) trait. Women use a variety of cues to assess male quality. Male genital modification is one way that some women assess their mates. Extreme male genital modifications not only honestly advertise status, sexual potency, and ability to provide sexual satisfaction, they may provide a reliable index of male-female cooperation through the male’s commitment to endure pain and risk. (shrink)

Here we attempt to define a specifically human ecology within which male reproductive strategies are formulated. By treating the domestic and public spheres of social life as "ecological niches" that men have been forced to compete within or to avoid as best they can, we generate a typology of four "social modes" of human male behavior. We then attempt to explain the broad distribution of social modes within and between human groups based on the relative intensity of scramble and contest (...) competition. (shrink)

Sex differences in mortality rates stem from genetic, physiological, behavioral, and social causes that are best understood when integrated in an evolutionary life history framework. This paper investigates the Male-to-Female Mortality Ratio (M:F MR) from external and internal causes and across contexts to illustrate how sex differences shaped by sexual selection interact with the environment to yield a pattern with some consistency, but also with expected variations due to socioeconomic and other factors.

The wealthy elite males of nineteenth-century Krummhörn (Ostfriesland, Germany) achieved an above-average reproductive success. Membership in the elite class was determined from a list of the 300 richest men in the Ostfriesland district compiled by authorities in 1812. The main components establishing the link between cultural success and reproductive success aredifferences in the number of offspring owing to differences both in time spent in fecund marriage (mating success) and in rate of reproduction;differences in the probabilities of one’s adult offspring marrying (...) locally vs. emigrating unmarried owing to differential ability to allocate resources that enhance the “social placement” of adult offspring; anddifferences in the probability of total reproductive failure (lineage extinction).Contrary to what might be expected, infant survivorship was lowest amongst the richest families. We conclude that to a great extent females’ reproductive decisions contribute to the greater reproductive success of the elite males. (shrink)

The suppression of sexuality is culturally widespread, and women’s sexual promiscuity, activity, and enjoyment are almost always judged and punished more harshly than men’s. It remains disputed, however, to what end people suppress sexuality, and who benefits from the suppression of female sexuality. Different theories predict that women in general, men in general, women’s intimate partners, or parents benefit most. Here we use the lies women and men tell—or imagine telling—about their sexual histories as an indirect measure of who is (...) most involved in the suppression of sexuality. We asked men and women what they would reply if asked questions by their mother, father, current partner, attractive confederate, and various same- or opposite-sex friends and colleagues about their number of previous sex partners, age at first romantic kiss, age at first consensual sex, and cheating on a previous partner or spouse. By comparing the size and direction of the lies that subjects told, we tested competing predictions of several cultural and evolutionary theories concerning why female sexuality is suppressed and who is driving its suppression. We found that men and women told larger and more frequent lies to their parents, with women telling the largest and most frequent lies of all to their fathers. Additionally, the majority of lies by both men and women were in sexually conservative directions. Our findings suggest that mothers, and especially fathers, restrict female sexuality. (shrink)

In this article, I show that principles from both evolutionary biology and evolutionary psychology inform a model of the actor that is usually implicit in sociological research on the family and social stratification. Making this evolved actor model explicit can unify and explain existing empirical sociological findings in these areas, and suggest new hypotheses for future research. I suggest the same is true in many other areas of sociology as well, and that explicitly incorporating a fully developed evolved actor model (...) into sociology can both unify the discipline and reconnect it with the other life sciences. (shrink)

The authors propose that many morbidities higher in women than men are adaptations protecting survival, selected because survival has been especially crucial to mothers' reproductive success. Following their lead, I pursue variation in tradeoffs between reproduction and survival recognized by Darwin that were likely central to the evolution of many traits that distinguish us from our great ape cousins.

The dualistic structures permeating western culture emphasize radical discontinuity between humans and nonhumans, but receptive attention to nonhuman others discloses both continuity and difference prevailing between other forms of life and our own. Recognizing that agency and subjectivity abound within nature alerts us to our potential for dominating and oppressing nonhuman others, as individuals and as groups. Reciprocally, seeing ourselves as biological beings may facilitate reconstructing our social reality to undo such destructive relationships.

In this paper data from a Tanzanian horticultural population are used to assess whether mother’s kin network size predicts several measures of children’s health and well-being, and whether any kin effects are modified by household socioeconomic status. This hypothesis is further tested with a questionnaire on maternal attitudes towards kin. Results show small associations between measures of maternal kin network size and child mortality and children’s growth performance. Together these results suggest that kin positively influence child health, but the effects (...) are small and it is unlikely that the high prevalence of undernutrition observed in this setting is influenced by the availability of kin. (shrink)

I argue that the magnitude and nature of sex differences in aggression, their development, causation, and variability, can be better explained by sexual selection than by the alternative biosocial version of social role theory. Thus, sex differences in physical aggression increase with the degree of risk, occur early in life, peak in young adulthood, and are likely to be mediated by greater male impulsiveness, and greater female fear of physical danger. Male variability in physical aggression is consistent with an alternative (...) life history perspective, and context-dependent variability with responses to reproductive competition, although some variability follows the internal and external influences of social roles. Other sex differences, in variance in reproductive output, threat displays, size and strength, maturation rates, and mortality and conception rates, all indicate that male aggression is part of a sexually selected adaptive complex. Physical aggression between partners can be explained using different evolutionary principles, arising from the conflicts of interest between males and females entering a reproductive alliance, combined with variability following differences in societal gender roles. In this case, social roles are particularly important since they enable both the relatively equality in physical aggression between partners from Western nations, and the considerable cross-national variability, to be explained. (shrink)