In order to resolve this controversy and understand our sexuality, society and politics, we need to learn something about the living conditions of our ancestors, to examine how Sapiens lived between the Cognitive Revolution of 70,000 years ago, and the start of the Agricultural Revolution about 12,000 years ago.

What makes us so adaptable? In one word, culture—our ability to learn from others, to copy, imitate, share, and improve.

Once upon a time, the story goes, we were hunter-gatherers, living in a prolonged state of childlike innocence, in tiny bands. These bands were egalitarian; they could be for the very reason that they were so small. It was only after the ‘Agricultural Revolution’, and then still more the rise of cities, that this happy condition came to an end, ush