Sex at Dawn

01The Standard Narrative We All Believed

For generations, we have been told a very specific story about human evolution, a story that feels so deeply ingrained in our collective consciousness that we rarely stop to question its validity. This story is what Christopher Ryan and Cacilda Jethá refer to as the Standard Narrative of Human Sexual Evolution. It is the classic tale of prehistoric boy meets prehistoric girl, governed by a rigid set of economic and biological trade-offs. According to this widely accepted model, early men were naturally inclined to wander and spread their seed, while early women were naturally coy, seeking a single, capable male who could provide resources and protection. In exchange for this male's meat and protection, the female offered exclusive sexual access, guaranteeing the male that any children she bore were genetically his own. This narrative forms the bedrock of our modern understanding of marriage, family, and society. It suggests that the nuclear family is the fundamental, natural unit of human existence. However, the authors argue that this perspective is entirely backward. What we have done is take our modern, capitalistic, property-driven anxieties and projected them backward onto our prehistoric ancestors. The authors brilliantly coin this phenomenon "Flintstonization." Just like the classic cartoon The Flintstones, where prehistoric cavemen drive cars with stone wheels, go to bowling alleys, and live in single-family suburban homes, we have assumed that our ancient ancestors lived with the exact same moral and social frameworks that we do today, just wearing animal pelts. To understand why this narrative became so dominant, we have to look at the people who originally wrote the scientific textbooks. Consider Charles Darwin, the brilliant mind behind the theory of evolution. Darwin was a product of the Victorian era, a time characterized by extreme sexual repression, rigid gender roles, and a profound emphasis on modesty and propriety. When Victorian scientists looked at the natural world, they were utterly incapable of viewing it objectively. They simply could not fathom a society—human or otherwise—where female promiscuity was not only common but socially beneficial. Therefore, they built evolutionary models that reflected the values of 19th-century England, cementing the idea that women are naturally monogamous and men are reluctant providers. Alongside this Victorian prudishness came the philosophical influence of thinkers like Thomas Hobbes. Hobbes famously described the life of early humans as "nasty, brutish, and short," painting a picture of prehistoric life as a constant, violent struggle for survival, where men fought each other to the death over scraps of food and access to women. This bleak view of human nature suggests that civilization, with its strict laws and marital contracts, rescued us from our base, violent instincts. We love this story because it makes us feel superior to our ancestors. It strokes our modern egos to believe that we are the pinnacle of progress. Yet, as the book meticulously points out, the Standard Narrative relies on the assumption that ancient humans treated food, shelter, and sexual partners as scarce commodities to be hoarded and traded. It implies a prehistoric marketplace where meat was exchanged for female fidelity. But when we actually study the way human beings lived for the vast majority of our history on this planet, this capitalistic assumption falls completely flat. For roughly two million years before the invention of agriculture, our ancestors lived in small, nomadic bands of hunter-gatherers. In these groups, the concept of a private nuclear family hiding in its own cave simply did not exist. Survival depended entirely on absolute cooperation, mutual aid, and the sharing of all resources. The Standard Narrative asks us to believe that while our ancestors shared their food, their shelter, and their childcare responsibilities, they suddenly drew a rigid, violent line when it came to sexual partners. It asks us to believe that a fiercely cooperative species was simultaneously governed by intense sexual possessiveness. By systematically breaking down the historical biases, the Victorian prudishness, and the philosophical pessimism that built this traditional view, the authors clear the stage for a much more logical, evidence-based understanding of human nature. The truth is far more complex, much more cooperative, and infinitely more interesting than the traditional story of the caveman trading a mammoth steak for a lifetime of female fidelity.