Well, up until about three months into gestation, we're all sort of unisex; the organs which later become male and female sexual parts are indistinguishable up until around one-third of the way through the pregnancy. Females need nipples for nursing; males don't do this, but the substrate needed for the females to have nipples is present in males as well; males simply don't develop these in the same way that females do, and they remain essentially vestigial.
Is Evolution Intelligent
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