Quote Originally Posted by khronik
Close... but even if you were spot-on I'd have to throw in my two cents, having studied sexual biology stuff quite extensively. We don't start out as females, we start out with generic genitals, and then go our separate ways at some point in utero. Also, ovaries and testicles grow from separate precursor tissue. One set develops and the other does not. The undeveloped set stays in our body, but is extremely small and only consists of a few cells. Scientists have found them though.

The best way I can think to explain it is, males have all of the genes that can be found in a female, and females have almost all the genes that can be found in a male. (females don't have the genes on the Y chromosome, but there aren't many there anyway)

Your sex does not determine what body parts you get, but how extensively those body parts develop. Girls have a vestigial penis, aka the clitoris. And guys have a vestigial vaginal opening, aka that ridge that runs from the underside of the penis to the back end of the scrotum.

So the short answer: guys have nipples because we have the genes for nipples. And it's a good thing too, because if we didn't, our daughters wouldn't get them.
My friend, I am glad it was you who posted. I am way too innebriated to have researched the proper medical answer and you were very tender to my inexperienced self! Thanks for the correct information!