If estrogen causes big butts, then why are there guys with big butts and girls with small ones?
I see this reasoning a lot and it doesn't make sense to me, estrogen is what causes girls to have bigger butts on average, but girls universally have higher estrogen than guys. However, there are quite a few girls with small butts and guys with big butts.
It differs by race also, Asian girls have very flat asses, while black boys have bubble butts. But I'm sure Asian women have more estrogen, so what gives?
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