Why do men have nipples?
961170
All fetuses start out essentially female before they develop into male or female, hence the nipples.
1123588
During pregnancy, the fetus inside the womb undergoes constant change in formation before finally being born.  All fetuses start off female, and require an extra hormone (XY chromosome) to start forming into a male.  So the nipples form before the male hormones are sent to the fetus.\n\nThere is one point in pregnancy where the fetus resembles a fish-like stage.  This is why humans have webbing in fingers and toes.  Crazy stuff, huh?
8533
Many answers.  Some guys like breasts because it reminds them of a safe place when they were children in the arms of their mothers (kinda gross, I know).  Others might like boobs because they like the idea of being able to touch that sensitive part of a girl that others guys can't.  You also have guys who likes to think of boobs as location of a kinky act.  The reasons are many.  I say they want to look, let them.  Once they start looking, we girls can get whatever we want from them :P
674385
They are called breasts.
391059
Marriage doesn't make any difference to the appearance of nipples.  I used to think that nipples had one tiny hole in the middle somewhere.  I got a surprise the first time I nursed.  The nipples have lots of little holes like a garden watering can.  The holes are so little you can't see them.
25734
Every egg starts developing in the womb as a female. The male genes kick in only later during the gestation. Consequently, an egg developing into a foetus develops nipples. After a certain stage, when the male genes kick in, the development of the breast is stopped. Thus men have nipple but don't have breast.
327505
There is a book that answers this question, along with a ton of other odd medical questions called "Why Do Men Have Nipples?"\n\nHaving read the book I now know that men have nipples because, in the womb we all start out as girls.  It's only after a certain point that the fetus' sexual organs become "outies".  So rather than a clitoris and ovaries,  Mr. Winkie and his two friends pop out.  That is if the baby is genetically destined to be a boy, of course.
267783
WHY DO WOMEN HAVE BOOBS?
539202
Men have nipples. That is just part of human anatomy for males and females. \n\nAs for beards, that is also part of our biology. Men\nhave testosterone hormone which increases their hair growth at puberty and then into manhood.\n\nSome woman with high testosterone levels also have hair growth on face, for which most use some form of hair removal creme or other method\n\nBeards are a mans preference. My husband loves to groom himself with different face fashions  mustache, gotti\nsideburns, sideburns that frame chin. \n\nHave you ever seen a really long mustache. I wonder about\nthose\n\nI know for years its been part of men and fashion statement.\n\nHow about those long long beards like zztop, very funky.\n\nBluebeard, Jesus Christ,  Saints, Monks, Pirates, Rock Stars, Johnny Depp in the Pirates of the Caribbean (oooh)The bearded lady at the circus. \n\nuh oh, i'm going off now. \n\nBeards. They feel fuzzy and scrape your face when he kisses you. They can stimulate you when they rub up against your body. Hmmm. Think about that. They can make a man look \ndistinguished or unkempt. They can have things crawling in them if your not careful soooo WATCH OUT when you kiss the bearded men. And check out what happens when you pinch their nipples!
60697
The Straight Dope says, "To tell you the truth, nobody really knows. The best explanation I've been able to find (and frankly it doesn't explain very much) is that nipples aren't a sex-linked characteristic. In other words, nipples are just one of those sexually neutral pieces of equipment, like arms or brains, that humans get regardless of sex." \n\nIt's also notable that the fetus starts to develop nipples long before any other sex-linked characteristics.
389195
Because when the baby is forming, it starts off with a female template. Later, if it's a boy, that kicks in and it starts to form as a male. The baby has already developed nipples by this time, so they keep them.
1036444
I think you're answering your own question.  You say that, according to creationism, women were created in man's image, which would mean that man existed before woman, which in turn would mean that Adam already had nipples and therefore Eve was created with nipples (in his image), but with breasts to feed her babies.\n\nSo, logically, men have nipples because they descend from Adam, who was created with nipples.
1087551
It's because human nipples appear during pregnancy in the third or fourth week of development, well before the sex characteristics. So the nipples are there before you become a girl or a boy. But once you become a boy, they don't just fall off.\nNote: Kilroymaster: Please name your source. From what I've read, no male of any kind, human or animal, has ever produced milk.
103974
Men & women start to develop as one entity, by the time the sex is determined the nipples on males have started to develop. Obviously the progression stops & men do not develop full breasts.
266670
Because your nipples are the most sensitive part on your body. Just like girls. Also your head of you penis and a girl's clit area. Mainly whats there is nerves that a very sensitive, obviously. Don't worry about it. It's natural.
1035564
i would say that is pretty much on instinct level men like them beause they are forbidden to see in public and they represent sex.  the breasts look like the behind which is what the male sees during sex primordially speaking.  Humans are the only animals that copulate face to face.
447265
It has to do with when the nipples develop in utero (when we are a fetus)...\nOne interesting consequence of the developmental set-up just described is that during the very early stages of fetal life, before the sex hormones have had a chance to do their stuff, all humans are basically bisexual. Among other things, you have two sets of primitive plumbing--one male, one female. Only one set develops into a mature urogenital system, but you retain traces of the other for the rest of your life.\nHuman nipples appear in the third or fourth week of development, well before the sex characteristics. (The sex hormones start to assert themselves at seven weeks.) As many as seven pairs of nipples are arranged along either side of a "milk line," a ridge of skin that runs from the upper chest to the navel. \nhttp://www.straightdope.com/classics/a1_...\n\nMale nipples aren't exactly a genetic glitch: they are evidence of our developmental clock. In the early stages of life from conception until about 14 weeks, all human fetuses look the same, regardless of gender. At the tender age of 14 weeks post-fertilization , genetically-male fetuses begin to produce male hormones including testosterone. These hormones turn the androgynous fetus into a bouncing baby boy. \nHere's where the developmental clock comes in. By 14 weeks, when the hormones turn on, the nipples have already formed. So, while our male fetus goes on to become a baby boy, he keeps his nipples, reminding all of us that people, male and female, started off the same way. \nMale nipples aren't exactly a genetic glitch: they are evidence of our developmental clock. In the early stages of life from conception until about 14 weeks, all human fetuses look the same, regardless of gender. At the tender age of 14 weeks post-fertilization , genetically-male fetuses begin to produce male hormones including testosterone. These hormones turn the androgynous fetus into a bouncing baby boy. \nHere's where the developmental clock comes in. By 14 weeks, when the hormones turn on, the nipples have already formed. So, while our male fetus goes on to become a baby boy, he keeps his nipples, reminding all of us that people, male and female, started off the same way. http://amos.indiana.edu/library/scripts/nipples.html