That's true, but inactive nipples don't cost anything, which certainly isn't the case for an inactive uterus. I don't know how it works, but I assume that such developments follow some kind of cost-benefit function.
afaik they serve some purpose in regulating androgenic-estrogenic hormone production.
The amount of testosterone in women is not zero, likewise the amount of estrogen in men is not zero as well, and breast tissue does serve some purpose in regulating hormoe production, even in men.
Aren't nipples pretty recent? The egg part has been there for a very long time, nipples haven't evolved as long, maybe in a few hundred million years we no longer have nipples.
That's true, but inactive nipples don't cost anything, which certainly isn't the case for an inactive uterus. I don't know how it works, but I assume that such developments follow some kind of cost-benefit function.
Not nipple related per se, but males do get breast cancer.
And, in weird circumstances, men can lactate. There's even a story about a viking whose name is escaping me who nursed his son after his wife died.
afaik they serve some purpose in regulating androgenic-estrogenic hormone production.
The amount of testosterone in women is not zero, likewise the amount of estrogen in men is not zero as well, and breast tissue does serve some purpose in regulating hormoe production, even in men.
Aren't nipples pretty recent? The egg part has been there for a very long time, nipples haven't evolved as long, maybe in a few hundred million years we no longer have nipples.
male and female sexual organs are the same thing inside out of each others, to some extent.