Not sure if nipples are the best analogy here. Formation of nipples is largely down to how fetuses develop; i.e. nipples form before sexual differentiation. And

Not sure if nipples are the best analogy here. Formation of nipples is largely down to how fetuses develop; i.e. nipples form before sexual differentiation. And I believe in some mammals, males in fact do not have visible nipples. https://www.livescience.com/32467-why-do-men-have-nipples.html https://www.livescience.com/32467-why-do-men-have-nipples.ht...