Based on natural selection
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Well, they would have disappeared if they weren’t functional. But after quite a while, things like this don’t have a fixed amount of time to happen.
Basically, if your friend down there works, there’s no need for humanity to change that. You are still capable to breed.
Obviously, if girls chose who to have babies with based on the weenie size, there could be a problem. But that’s not the case.
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