To determine our mating system we need to know our natural habitat and our past. We have lived mostly in cities for less than one thousand years. We have been agricultural for less than ten thousand. These are mere eye blinks. For more than a million years before that we were recognizably human and living, mostly in Africa, probably as hunter-gatherers, or foragers, as anthropologists now prefer to say. So inside the skull of a modern city dweller there resides a brain designed for hunting and gathering in small groups on the African savanna. Whatever humanity’s mating system was then is what
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