Free download of Sex At DawnThe Prehistoric Origins of Modern Sexuality Christopher Ryan and Cacilda Jetha. Available in PDF, ePub and Kindle. Read, write reviews and more Sex at Dawn, How We Mate, Why We Stray, and What It Means for Modern Relationships Christopher Ryan and Cacilda Jetha is now one of my favorite books this year. In this video I talk a bit about "Sex at Dawn challenges conventional wisdom about sex in a big way. examining the prehistoric origins of human sexual behavior the authors are able to expose the fallacies and weaknesses of standard theories proposed most experts. This is a provocative, entertaining, and pioneering book. I learned a lot from it and recommend it highly. Sex at Dawn: The Prehistoric Origins of Modern Sexuality, is a 2010 book about the evolution of monogamy in humans and human mating systems Christopher Ryan and Cacilda Jeth