I agree with the second half of your post, but hunter-gatherer was an unfortunate choice of words. Societies tend to "evolve" due to scarcity induced by populat

I agree with the second half of your post, but hunter-gatherer was an unfortunate choice of words. Societies tend to "evolve" due to scarcity induced by population density, as the first steps of the technology tree simply aren't that enticing when nature still provides plenty. Arguably we see the same thing with fossil fuels today. What I'm saying is that I'm not so sure reaching a higher population is hindered by a liberal approach to sex (pre-contraception).