Coming to terms with the female orgasm : Greg Laden's Blog: "The point is this: Human ancestors, just under 2 million years ago, underwent an ecological change that required that they live in multi-male multi-female groups, like chimps do, but that also resulted in selection for a mostly monogamous (or at least, less poygynandrous) mating system, kinda like gibbons have today, but really, not very different from typical modern human marriage."
'via Blog this'
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