Book excerpt: For some time sex has been defined as the biological difference between men and women, and gender as the manner in which culture defines and constrains these differences. Feminine/masculine, male/female, women/men, boy/girl - terms of sexual and gender division like these permeate the way we think and talk about ourselves and each other. On most occasions we find their use non-problematic and people employ them easily, at other times, however, particularly if we are interested in psychology, we may wonder whether this ease is illusory.; One may speculate whether being a woman necessarily implies being "feminine". One may question why young women are often referred to as girls, while men are seldom referred to as boys. Is dressing in a stereotypically feminine manner a reliable indication that a woman is heterosexual? What about cross dressing? Why do these topics hold so much fascination for the media?; "Gender, Sex and Sexuality" examines the effects that the inequalities experienced between men and women have had on the psychologies of both sexes, and the battle to remove them. It aims to introduce the reader to current research and theories, drawing on novels, theatre, soap operas, as well as research for case histories.