Why?
In: Biology
Testosterone is a hell of a drug. There’s no significant difference in physical capabilities of prepubescent boys and girls but once puberty hits the male body is essentially producing its own performance enhancing drugs.
If you mean why does male physiology do this and female physiology not, that’s just evolutionary roles. For most mammals selective pressures favoured strong aggressive males that would fight off threats and competitors and females that would nurture their young.
Higher brain function is a relatively recent thing and evolution doesn’t really have any mechanism that removes traits that are no longer necessary so on a purely biological level we’re sort of stuck with a bunch of stuff that was mostly helpful hundreds of millions of years ago when the evolutionary line was a small rodent-like creature.
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