Drawing on the latest research evidence, the authors of this textbook examine the extent to which men and women actually differ, and the origins and implications of the differences, in physical development, sexual experience, emotional expression, mental health, aggression, power, family life, work and achievement. They consider, too, general issues in sex and gender research: stereotypes and common-sense beliefs, problems of measurement and objectivity in the social sciences, the interaction of nature and nurture, developmental pathways, and social change.