Fighting ability, although recognized as fundamental to intrasexual competition in many nonhuman species, has received little attention as an explanatory variable in the social sciences. Multiple lines of evidence from archaeology, criminology, anthropology, physiology, and psychology suggest that fighting ability was a crucial aspect of intrasexual competition for ancestral human males, and this has contributed to the evolution of numerous physical and psychological sex differences. Because fighting ability was relevant to many domains of interaction, male psychology should have evolved such that a man's attitudes and behavioral responses are calibrated according to his formidability. Data are reviewed showing that better fighters feel entitled to better outcomes, set lower thresholds for anger/aggression, have self-favoring political attitudes, and believe more in the utility of warfare. New data are presented showing that among Hollywood actors, those selected for their physical strength (i.e., action stars) are more likely to believe in the utility of warfare.

Based on sexual selection theory, we hypothesized that sex differences in mating effort and social competitiveness-and subsequent sex differences in sexual and competitive motivations for participating in drinking games-are responsible for the welldocumented sex differences in college students' drinking game behaviors. Participants in a cross-sectional study were 351 women and 336 men aged 17 to 26. In a mediation model, we tested sex differences in mating effort, social competitiveness, sexual and competitive motivations for participating in drinking games, drinking game behaviors, and alcoholrelated problems. Men participated in drinking games more frequently, consumed more alcohol while participating in drinking games, and experienced more problems associated with drinking. These sex differences appeared to be partially mediated by mating effort, social competitiveness, and sexual and competitive motivations for participating in drinking games. Drinking games are a major venue in which college students engage in heavy episodic drinking, which is a risk factor for college students' behavioral and health problems. Thus, the functional perspective we used to analyze them here may help to inform public health and university interventions and enable better identification of at-risk students.

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Evolutionary-minded scientists have proposed that humor is a sexually selected trait in men that signals mate quality. Indeed, women tend to prefer men who make them laugh and men tend to prefer women who laugh at their jokes. However, it is unclear how robust this pattern is. Here we report a replication of one of the first studies (Bressler, Martin, and Balshine, 2006) to examine the sex differences in preferences for humor receptivity versus humor production. We replicate Bressler et al. 's (2006) findings that men prefer women who are receptive to their humor whereas women prefer men who produce humor. These findings held even after we modified Bressler et al.'s questionnaire for better conceptual validity. Furthermore, using a separate measure designed to assess trade-offs, we found that men viewed humor receptivity as a necessity and humor production as a luxury when they were asked to create an ideal long-term partner. For women, it was just the opposite. These results bolster the claim that sexual selection has shaped sex differences regarding preferences for a prospective mate's sense of humor and that what one means by "sense of humor" can vary.

College men's alcohol consumption is positively associated with sexual aggression perpetration, yet men's drinking does not typically predict later sexual assault after accounting for risk factors, such as impersonal sexuality. In the present study, we tested an indirect effects model whereby college men's impersonal sex orientation and heavy episodic drinking (HED) were hypothesized to contribute to sexual aggression perpetration via more frequent attendance at drinking venues (parties, bars). Method: Freshman males (N = 1,043) were recruited to participate in a five-semester study. Key measures included the Sociosexuality Index as a measure of impersonal sex attitudes and behaviors, frequency of HED, and frequency of attending drinking venues (parties, bars). The dichotomous outcome measure was based on the Sexual Strategies Survey, a measure of tactics used to convince a female partner to have sex. Structural equation modeling was used to examine whether sociosexuality attitudes, sociosexuality behaviors, and HED (all measured at Wave 1) would have direct and indirect effects on use of Wave 5 sexual aggression tactics, through effects on Wave 3 venue attendance. Results: The model supported the hypothesized indirect effects of sociosexuality and HED via men's subsequent drinking venue attendance and was preferred over alternative models. Conclusions: College men who more frequently attended drinking "hot spots" were more likely to perpetrate subsequent sexual aggression, supporting a growing body of evidence on the importance of drinking venues in college sexual assault. Findings also help to explicate the mechanism underlying the robust role of impersonal sex orientation in sexual aggression.