I think it's reasonable to surmise that men and women have had different evolutionary paths. Maybe we all started from the same bacteria at one point, but different species diverged a long time ago. More recently than that, but a long time ago, species developed sexual reproduction. Since then, men and women's paths have diverged quite a bit. No reason to think they are the same, so why you would assume they are (or even should be) treated the same? I mean, it's kind of a square peg, round hole situation. Obviously, not to say you want people disparage each other, but it's possible that men and women fundamentally have slightly different needs, so why not attempt to cater to them? In theory, that would improve everybody's situation.