"...a landmark book in the field...a sophisticated advance in our understanding of sex differences in social behavior...must reading for all students of social psychology, the psychology of women and gender."—Janet Shibley HydeUniversity of Wisconsin"...the most comprehensive analysis yet of the basis for many psychological sex differences...raises the study of sex differences to a new level of empirical and theoretical sophistication. The book is beautifully written, detailed yet easy to follow...balanced and thoughtful."—Judith A. HallNortheastern University