influences of altruism and bravery in the evolution of heroism. Our study found that females do prefer risk-prone brave males to … factor influencing female choice of short-term partners, long-term partners, and male friends, with altruism playing a lesser … part in their choice. Altruism was deemed important in long-term relationships and friendships, but for short-term liaisons …

altruism, and (3) the possibility of sustained mutual cooperation in finitely repeated social dilemmas is affected by the …

across individuals. In the research reported here, we examine two models of heterogeneous utility, linear-altruism and …