Sex and Gender 2nd edition is a substantially revised edition of a classic text. Adopting a balanced and straightforward approach to the often controversial study of sex differences, the authors aim to introduce the reader to the fundamental questions relating to sex and gender in an accessible way at the same time as drawing on the very latest research in this and related areas. New developments which are explored in this edition include the rise of evolutionary psychology and the influence of Social Role Theory as well as new psychoanalytic and ethno-methodological approaches which have all contributed to a greater understanding of the complex nature of masculinity and femininity.