Why are women biologically driven to find Mr. Tall, Dark, and Handsome? Can more sex help ensure a safe pregnancy? What effect does pornography have on a man's fertility? In this compelling follow-up to the New York Times bestseller Survival of the Sickest, Dr. Sharon Moalem takes us on a trip from prehistory to the forefront of cutting-edge medical research, and through a bedroom or two, to tell the story of how human sexuality has developed over time. How Sex Works challenges common perceptions about our bodies and provides astonishing discoveries from the frontiers of science as it traces the transformation of sex across species and through time to its current role in human societies. Find out the answers to such provocative questions as: Can the birth control pill influence the type of men women are attracted to? What do men and honeybees have in common when it comes to sex? Why do hourglass-shaped women tend to be especially fertile? When are women most likely to cheat? Can twins have different fathers? From the composition and function of human sex organs to the fascinating biochemistry behind sexual attraction, How Sex Works presents captivating new ideas and surprising answers to questions about contraception, fertility, circumcision, menopause, STDs, homosexuality, orgasms, and more. This is an entertaining, comprehensive exploration of culture, biology, and history that takes us far beyond our common understanding of sex.