Comprehensive overview of the science behind human sexual behavior from a biopsychosocial perspective. By emphasizing psychological research and theory on human sexuality, Lehmiller reveals the psychological importance of possessing familiarity with one's body for forming healthy sexual relationships, and shows how a lack of such knowledge can lead to sexual and relationship difficulties. Designed to be inclusive and respectful of a diverse audience, Lehmiller's analysis also includes instructor resources designed to facilitate a dynamic and interactive classroom environment and enhance critical thinking.