You could always look up Trivers' work.
Apparently some other people think that they do understand what I'm saying but they don't like it and have consequently downgraded my post!
It's the old "nature vs nurture" thing: those who don't like my posting are "nurturists" and believe that we're born as tabulae rasae, empty slates that learn all behavior; I'm seen as the "naturist" who believes that we're totally gene-controlled.