About one eighth of people are exposed to adversities such as abuse and neglect. Life
history theory suggests that early experiences of adversity are strongly associated with later …

The decision with whom to form a romantic bond is of great importance, yet the biological or
behavioral mechanisms underlying this selective process in humans are largely unknown …

Previous research has examined the phenomenon of “sexual fluidity,” but there is no current
consensus on the specific meaning and operationalization of this construct. The present …

This chapter reviews extant research on the lifespan development of diversity in sexual and
gender identity and expression. We focus primarily on the developmental experiences of …

Female sexual orientation and its various species-wide and species-specific manifestations
comprise a topic to which one scientific article can hardly do justice. We have nevertheless …

Psychological sex differences have been studied scientifically for more than a century, yet
linguists still debate about the existence, magnitude, and causes of such differences in …

Heterosexual men report less distress at infidelity from female interlopers than male
interlopers. In addition to presenting no risk of cuckoldry, men could also perceive these …

The present study sought to investigate sex and sexual orientation differences in several
traits related to sexuality and sexual behavior. Examining sexual orientation differences …

There is tremendous variety in the sexual behaviors and mating strategies observable
across individuals, genders, cultures, populations, and ecologies. One critically important …

Past research suggests an apparent paradox: Women who engage in same-gender sexual
behavior show higher rates of unintended pregnancy than women with exclusive other …