The army is one of the best examples of gender inequality towards MEN

[Gawdzilla Sama]

In the deep time past the women had to be near the children to feed them before they could eat "adult" food. The meant the men did the long hunts, sometimes three or four days. The women were responsible for camp security, they had to be ready to deal with an incursion by dire wolves, etc. You can see how things sorted themselves out from that.