Based on natural selection
In: 0
Because sperm can move on their own, and so penis size has no bearing on evolutionary advantage. As long as you get it in there, the little swimmers can handle the rest.
why haven’t micro-penises died out?
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Based on natural selection
In: 0
Because sperm can move on their own, and so penis size has no bearing on evolutionary advantage. As long as you get it in there, the little swimmers can handle the rest.
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