Free of the time pressures that dictated the love lives of women, men had evolved to want no-strings sex.
By showing that committed fathers are able to lower their hormonal thermostats, the finding upends the classic view that men evolved solely to be hunters and providers, Kuzawa explains.
Over thousands of years, she says, men may have evolved to choose less feminine women in harsher conditions to give them an edge at survival.
Natural selection is morally neutral: even if men and women have evolved to be, on average, differently skilled at some specific task, that simply has no bearing on a political commitment to egalitarianism in that area.
As men and women have evolved to compete for sexual partners, we can expect the modern work place to be a hotbed of sexual emotions, which might need to be regulated (Browne, 2006).
It's part of the genetic strategy that evolved to help men spread their genes far and wide.
And through a series of small, incremental changes, various pieces of men's attire that had evolved to meet specific needs converged to form a single uniform.
Some experts suggested the tears could have evolved to reduce men's aggression toward women who are weakened by emotional stress.
I've even seen a theory which states that breasts evolved to remind men of their mother's buttocks, a familiar and reassuring site for tree-climbing primates, and a notion to make every male reading this recoil in oedipal disgust.
