A survey and critical evaluation of research investigating individual, social, psychological, and cultural factors in sexual behavior, with some attention to the biological underpinnings of sexuality, along with comparison and contrast across individuals, cultures, and species. Common topics include sex research methodology, gender, sexual orientation, changes across the lifespan, paraphilias, and non-human sexual behavior. Readings include selections from works that have changed understanding of sexual behavior. Prerequisite: PSYC 100 or 101 or junior standing.