Are humans naturally monogamous? In this revolutionary book, the author duo challenges the conventional concepts of human sexuality and evolution. Based on evidence from anthropology, archaeology, and primate science, they show that modern monogamy is not an original human nature, but rather a social structure following the agricultural revolution. From the free sexual lives of prehistoric humans to the psychological causes of present-day marriage and infidelity, everything is brilliantly analyzed here. To gain a deep and unconventional perspective on the primitive identity and sexual behavior of humans, this is a must-read book for researchers and general readers alike.