In this book, author makes years of scholarly research accessible to the general public. The research, including 2000 questionnaires, 200 interviews, and an extensive bibliography, indicates that men and women across many cultures have evolved a psychobiological response to sexual relationships. Men want young, beautiful women and casual sexual relationships; women look for committed relationships with men of wealth and status. Even among "liberated" individuals, these statements hold true. The author, a professor of anthropology who has published many scholarly articles, explores why this hasn't changed despite the changing sex roles and economies of modern American society. A well-written, well-researched, and fascinating read