My curiosity got the better of me and I googled 'Men's Nipples'. My extensive research reveals that nipples are left over from the womb. Here's something I found rather shocking...
Men have nipples because we all were conceived female. Somewhere during conception or pregnancy we either stay a female or turn into a male. You may notice male and female have all the same "bits" but they differ in size and function. the clitoris for example is the female counterpart to the penis........ovaries to gonads ........and nipples either sit on a pair of breasts or for the male are just there.That paragraph explains a lot of things. Men don't turn gay. They are merely renouncing their gender!
Oh wait...there's more! Men can produce milk!!! I ain't kidding!
Male humans can and do produce milk; ie, they can lactate. Male breasts contain all the structures needed to produce milk.
Further, it is not uncommon to observe lactation in both male and female infants, due to the stimulation they receive from their mother's hormones.
I swear to god that if I ever start producing milk, I'll faint and probably die of a freaking heart attack!
I've got a strong feeling that I'll have nightmares about nipples tonight. On the other hand, I wouldn't mind a dream about some hot chick and her perfect pointy nipples. I've gotta head to work. Enjoy the weekend and have a nipple-licious Friday!
(My thanks to WikiAnswers and SensualReading for the outstanding Nipple information.)