It's nothing to do with men being "forced" to do anything, it's simply that in every sexual species the selective pressures on males and females is very differe

It's nothing to do with men being "forced" to do anything, it's simply that in every sexual species the selective pressures on males and females is very different. In mammals the females have to be strong enough to carry a baby until birth. While the males have to be stronger than all other males; long term health is much less important.