Well of course there are no true non-relatives, even the sabertooth and antelopes are distant cousins. The question is how much you’re willing to give up for how distant cousins. Here I think the mechanism I describe changes the calculus.
I don’t think we know enough about the lifestyles of cultures/tribes in the ancestral environment, except we can be pretty sure they were extremely diverse. And all cultures we’ve ever found have some kind of incest taboo that promotes mating between members of different groups.
Well of course there are no true non-relatives, even the sabertooth and antelopes are distant cousins. The question is how much you’re willing to give up for how distant cousins. Here I think the mechanism I describe changes the calculus.
I don’t think we know enough about the lifestyles of cultures/tribes in the ancestral environment, except we can be pretty sure they were extremely diverse. And all cultures we’ve ever found have some kind of incest taboo that promotes mating between members of different groups.