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It surely worked then like it does today, and female sexual selection is an important part of the hierarchical nature of humankind, one of the major things that invokes the warring nature of man. (Invokes, not causes. It's built-in.)
(i.e., you don't make us go to war - but we would only do it because of you. We don't defend territory, like dogs; we defend family and tribe, like apes. Plus I saw Omar looking at your ass so I hit him with a big rock. Don't you like that?)
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