I wanna make a couple points here.
First is, you need to define a normal environment here. It seems likely that there would have been multiple different environments in the precivilized and that those differences would manifest in different mating behavior. We could have multiple systems, each of which were fairly normal and widespread.
Second is, we need to recognize that people have different personalities as a consequence of very fine biological differences. We might find that there's a spectrum of behaviors or possibly specific roles a person may be born to play. To simply pick some average value as the default would be quite misleading!
First is, you need to define a normal environment here. It seems likely that there would have been multiple different environments in the precivilized and that those differences would manifest in different mating behavior. We could have multiple systems, each of which were fairly normal and widespread.
Second is, we need to recognize that people have different personalities as a consequence of very fine biological differences. We might find that there's a spectrum of behaviors or possibly specific roles a person may be born to play. To simply pick some average value as the default would be quite misleading!
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