https://www.youtube.com/watch?v=Ez7RUSCUhzk

You think you have it rough? Just try being a male ram. The alpha gets to breed with all the females. The competition? HOURS of high-impact head-butting. Sure, there are some low-blow tactics that can be used to goose the odds, but ultimately it comes down to hours of head-butting. But, wait, there is more!

https://www.youtube.com/watch?v=zj8istSAMoY

The females don't just sleep with the victor of the head-butting competition. They have to be chased. And while the victor chases them, his rivals have opportunities to attack him.

Comparatively speaking, all men have to do is lift, dress well, make money, and learn some game.