heh heh heh "coupled with sex" he he he

And why does the doll have to be anatomically correct? I mean, if you're having sex with inanimate objects...

Our sperm is heterospermicidal, so we did not evolve to be faithful.

Actually, female orgasm only ups the likelihood of conceiving a boy, not just conceiving. Shallow penetration and no orgasm gives you a better chance of conceiving a girl.

Most male mammals don't "choose" a mate - they go from receptive female to receptive female till they run out of females. And they'll go for those signalling receptivity most strongly first - no brain involved, just responses to stimulating stimuli.

Female animals, in contrast, do choose mates, and some theorize that it is that cshoosing ability in particular that got all evolved into intelligence...