Sex and Gender (2nd edt.) is a substantially revised edition of a classic text. Adopting a balanced approach to the often controversial study of sex differences, the authors introduce the reader to the fundamental questions relating to sex and gender in an accessible way. Drawing on the latest research, new developments are explored such as 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.