If Muscular Men Get More Action, Why Hasn’t That Become a Dominant Human Characteristic?

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According to a new study, muscular men have more sexual partners in a lifetime than skinny dudes. So why hasn't humanity naturally selected toward macho men? In part because they have weaker immune systems, and because they need to eat more to survive. So it's win-lose for both. But here's the real, important question: What happens if you are skinny fat? [Freakonomics/NYT]