Examination of what it means to be male. Draws on biology, genetics, anthropology and psychology. Questions what makes a boy a boy, why men are fascinated by sex, and whether men and women are really so different. Covers origins of men, men in prehistory, zoology, gender, sperm, fertility, the penis, impotence, arousal, chemistry, psychology, and the future. Includes endnotes and index. Author has worked on the 'Sydney Morning Herald' as science and environment editor, chief of staff and European correspondent. He is now a freelance writer and regularly contributes to the 'Bulletin'. Previous title is 'The Vanishing Continent', co-written with Peter Fray.