An evidence-based, accessible introduction to the study of sexuality and the diverse ways in which it brings joys and challenges to our lives. Now in its fourth edition,Discovering Human Sexualityhas established itself as a popular and widely praised text that respects diversity both in the sexual world and among the students who read it. The backgrounds of the authors--in biology, sociology, teaching, and writing--have made possible a text that is multidisciplinary, authoritative, sex-positive, and a delight to read.The scope ofDiscovering Human Sexualityranges from homosexuality in ancient Greece to the recent Harvey Weinstein sexual harassment scandal while covering a stunningly diverse array of topics. Questions considered include: How does the menstrual cycle work? What's "splitting the bamboo"? Can premature ejaculation be treated? If a man has undetectable levels of HIV, can he have sex without condoms? Which sex offenders will repeat their crimes? Is there a gay gene? What's wrong with polygamy? Is emergeny contraception abortion? Which bathrooms should trans women use? This book gives factual answers to important questions and provides material for informed debate for issues without a single solution.