The book Sex at Dawn is about the primitive origins of human sexual behavior. According to the authors, sex was a shared resource during the hunter-gatherer phase of human history; sex is said to not have been distinguishable from childcare, food, or group defense in terms of how communal it was (Ryan & Jethá, 2010). The authors argue that there is apparent bias in the discipline of evolutionary psychology that ignores the primal instincts of sexual behavior where hunter-gatherer culture has been rewritten to fit modern social constructs. The main theme of the book is that monogamy is a modern social construct that did not exist in primitive societies. The book offers a variety of evidence to prove the case that the human species is not adopted for monogamy. Evidence such as female copulatory vocalization, testicle size and sexual dimorphism, desire for sexual novelty, hidden female ovulation, and various sexual practices are said to point to polyamorous predisposition. The authors also argue that during more primitive times, there was no intragroup competition for sexual mates because sex was not a scarce commodity. The more important factor was sperm competition compared to sexual selection, which is said to persist among remaining hunter-gatherer communities (Ryan & Jethá, 2010). The book implies that a standard model exists regarding sexual behavior among humans that tries to conceal the true nature. This standard model is said to support monogamy; while the book does not outrightly oppose monogamy, it does imply an effort to hide the primitive nature of human beings in favor of monogamy. In the standard narrative, the male is drawn to youth, health, fertility, absence of sexual past, and the possibility of future fidelity, which is interpreted as looking for a fertile, youthful woman with a substantial child-bearing period remaining. The female, on the other hand, is drawn to sign of wealth or social status and physical health which is a thinly veiled desire for a mate that will take care of her and children. According to the authors, current mating behaviors are not so much human nature as they are adaptations to the present social setting. The authors have supported their case with evidence delivered from a variety of sources such as academic books, newspaper articles, and peer-reviewed sources from as far back as 1978 to 2008. The advantage of this is that it appeals to both academic and non-academic audiences, but it is a pitfall if the goal is academic such as was with this book. Analysis of the Book The book has tried to confront standard theories in evolutionary psychology. The book does a good job of marrying various subjects spanning social science, neuroscience, and social science. The authors have presented evidence not used before in support of the theory. The writing style is flexible enough to even have pop-culture appeal. There were previous attempts to challenge the construct of monogamy, but none had delivered a case as robust as this one in such a relaxed style. Some have been brazen in their support for promiscuity, but the authors of Sex at Dawn seek to only reveal that which is hidden. By so doing, they are able to capture the curiosity of both prop