You need to ask the evolutionary biology types about the fixation on Paleolithic humans, because they are the ones asserting that our ancient ancestors were designed to "spread their seed" - which explains (according to them) why men today are evolutionarily programmed to be promiscuous and women are designed to be choosy (except that they're not).

I appreciate your more complex calculations, but it's even simpler than that. Ask modern humans how many partners they've had in the past year or ever and you find that it's on average the same for men as it is for women - which makes sense, right - on average 1.