Evolutionary psychology, with insights from genetics, anthropology and cognitive psychology, illuminates how fundamental aspects of the way humans think, feel and interact derive from reproductive interests and an ultimate need for survival. In this updated and expanded edition, the author considers the emergence of Homo sapiens as a species and looks at contemporary issues, such as familial relationships and conflict and cooperation, in light of key theoretical principles. The book covers basic concepts including natural and sexual selection, life history theory and the fundamentals of genetics. New material will be found in chapters on emotion, culture, incest avoidance, ethics and cognition, and a whole section devoted to the evolutionary analysis of mental disorders. This comprehensive textbook will be of great value to students of psychology, human biology and physical and cultural anthroplogy.