why do nipples get hard
In: Biology
So it’s easier for a baby to latch onto them (newborns are a bit useless, and need all the help they can get).
It happens to men too because men also have nipples, made of nipple material. Their mammary glands are just not developed enough to actually feed anything.
Evolution is like this. Pretty much every mammal has nipples as milk production zones. Somewhere way back in our ancestry, the babies descended from stiff-nipple mothers survived better than those whose mums nipples didn’t react, so here we all are.
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