Humans are an intensely social species, frequently performing costly behaviors that benefit
others. Efforts to solve the evolutionary puzzle of altruism have a lengthy history, and recent …

What motivates grandparents to their altruism? We review answers from evolutionary theory,
sociology, and economics. Sometimes in direct conflict with each other, these accounts of …

Research conducted in the last fifteen years has placed in question many of the traditional
conclusions scholars have formed about human female sexuality. Though conventional …

Mental disorders arise from neural and psychological mechanisms that have been built and
shaped by natural selection across our evolutionary history. Looking at psychopathology …

Contrary to assumptions underlying current psychological theories of human mating,
throughout much of human history parents often controlled the mating behavior of their …

Evidence from the anthropological record indicates that in most human societies, parents
control the mating access to their offspring. Based on these data, a model of sexual selection …

Human mate choice is central to individuals' lives and to the evolution of the species, but the
basis of variation in mate choice is not well understood. Here we looked at a large …

In collectivist cultures, families tend to be characterized by respect for parental authority and
strong, interdependent ties. Do these aspects of collectivism exert countervailing pressures …

Parent–offspring conflict theory hypothesizes that interests of offspring and parents are
asymmetrical in key contexts including the offspring's mating strategies and mate …

Decades of research demonstrate that conflict shapes and permeates a broad range of
family processes. In the current article, we argue that greater insight, integration of …