He enjoys the study of behavior genetics where his books "The Evolution of Desire" and "The Murderer Next Door" explore sexual desire and homicide, respectively. His latest book is "Why Women Have Sex: Understanding Sexual Motivations from Adventure to Revenge (and Everything in Between)." In all his works, Buss describes the results of research for various aspects of mate selection, either good or bad. From why men and women pick their partners to how a murderer takes rejection poorly.