Hey, guys, here's the real reason you have those pointless nipples1/10/2013
It's one of the most enduring questions about human existence. No, not "Why are we here?" We're talking about "Why do men have nipples?" It turns out that even though male babies get that Y chromosome, it's the female X chromosome that gets to work on a fetus right away, and with the X chromosome come a handful of female traits — such as nipples. In essence, we all start off as females in the womb. Ultimately, when the Y chromosome kicks in, it halts some features of female development and transforms female reproductive organs into male ones. But by that point, the nipples are already in place; men just don't go on to develop breasts.
Were you surprised by this explanation?