why do men have nipples?
406989
In my undergrad biology days, this was actually discussed in a developmental biology class.\n\nMen have nipples because, at one time in the womb, they were female.  As the embryo develops, it takes the influence of genes located on the Y chromosome to allow the fetus to develop primary male sexual characteristics.  Up until that point, only the X chromosome is active, and nipple formation has already taken place.\n\nThe nipples are not a purely female trait; it's the mammary tissue in the breasts that are the real indicator.
1156952
are you a male ? why would you need to pump your own nipples?
309244
because all babies start out as "females" it's later in the development that the male genitals grow, by then the nipples have already formed.
1129775
ALL nipples are sexy (thats' cause I love women so much, \nespecially their breasts). Leave nature alone, I'm sure you're\nbeautiful just as you are.
867768
Answer this.\nWould you want to be showing your breast?\nAnd men dont have breasts. They have chests.
1152389
"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\nSee the Straight Dope for more information.
296121
"To tell you the truth, nobody really knows." http://www.straightdope.com/classics/a1_093.html\n\n"Men and women are mammals (from the Latin mamma breast) a species that have breasts and feeds its young with milk. The human embryo has tissue that will evolve into breasts. Both male and female babies are born with nipples and ducts intact. It is the presence of genes that direct hormones to differentiate the breast tissue. The Y chromosome stimulates hormones such as testosterone to form male features."\nhttp://www.plasticsurgery4u.com/male_plastic_surgery/why_men_have_nipples.html
449265
most men, gay or straight, were breast-fed.  i think there's just something biologically comforting about breasts, as the original source of food and affection.  as women, we have our own, but men must be drawn to them on a subconscious level, even if they're not sexually interested in the woman.
395112
Men have nipples b/c humans all come from a common ancestor.  And when we evolved, certain structures remained w/o a purpose.  This is refered to as having vesigal structures--a body part that has no function.  It is equivalent to hip bones in snakes and wing bones in dolphins.
265525
Nipples are not too much attractive as the whole breast are.But its very sensitive,so it should be covered for its sensitivity.
658338
Males and females develop from a similar template in the womb. Before about 3 months the fetus is sexually undifferentiated, and distinctively male or female genitalia develop from a similarly structured organ, i.e. testes and ovaries both develop from an undifferentiated gonad. So males have nipples because of similarities between males and females before sexual differentiation occurs. \nHowever, it actually is possible for some men to produce milk in small quantities under some circumstances. Apparently men who play with their nipples alot may start to produce milk! Some men also produce milk when their wives are pregnant! Sort of like a sympathy response.
141834
we don't have them...you always hide them...\nperhaps since you have no appendage hanging out to get visually hard...but you do have nipples...maybe some men think when they are hard your hot and ready...
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.
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.
1173882
ASK THE EXPERTS: BIOLOGY   \n \n \n \n \n \nWhy do men have nipples?  \n \n \nAndrew M. Simons, a professor of biology at Carleton University in Ottawa, Ontario, explains. \nLike all "why" queries, the question of why men have nipples can be addressed on many levels. My four-year-old daughter, always suspicious of a trick when asked such obvious questions, answered: "because they grow them." In search of the trick answer, she quickly added that "chests would also look pretty funny with just hair." \n \n \nADVERTISEMENT (article continues below) \n \n \n \nEvolutionary biologists, whose job it is to explain variety in nature, are often expected to provide adaptive explanations for such "why" questions. Some traits may prove—through appropriate tests—to be best explained as adaptations; others have perfectly good evolutionary, but nonadaptive, explanations. This is because evolution is a process constrained by many factors including history, chance, and the mechanisms of heredity, which also explains why particular attributes of organisms are not as they would be had they been "designed" from scratch. Nipples in male mammals illustrate a constrained evolutionary result. \nA human baby inherits one copy of every gene from his or her father and one copy of every gene from his or her mother. Inherited traits of a boy should thus be a combination of traits from both his parents. Thus, from a genetic perspective, the question should be turned around: How can males and females ever diverge if genes from both parents are inherited? We know that consistent differences between males and females (so-called sexual dimorphisms) are common--examples include bird plumage coloration and size dimorphism in insects. The only way such differences can evolve is if the same trait (color, for example) in males and females has become "uncoupled" at the genetic level. This happens if a trait is influenced by different genes in males and females, if it is under control of genes located on sex chromosomes, or if gene expression has evolved to be dependent on context (whether genes find themselves within a male or a female genome). The idea of the shared genetic basis of two traits (in this case in males and females) is known as a genetic correlation, and it is a quantity routinely measured by evolutionary geneticists. The evolutionary default is for males and females to share characters through genetic correlations. \n\n \nThe uncoupling of male and female traits occurs if there is selection for it: if the trait is important to the reproductive success of both males and females but the best or "optimal" trait is different for a male and a female. We would not expect such an uncoupling if the attribute is important in both sexes and the "optimal" value is similar in both sexes, nor would we expect uncoupling to evolve if the attribute is important to one sex but unimportant in the other. The latter is the case for nipples. Their advantage in females, in terms of reproductive success, is clear. But because the genetic "default" is for males and females to share characters, the presence of nipples in males is probably best explained as a genetic correlation that persists through lack of selection against them, rather than selection for them. Interestingly, though, it could be argued that the occurrence of problems associated with the male nipple, such as carcinoma, constitutes contemporary selection against them. In a sense, male nipples are analogous to vestigial structures such as the remnants of useless pelvic bones in whales: if they did much harm, they would have disappeared. \nIn a now-famous paper, Stephen Jay Gould and Richard C. Lewontin emphasize that we should not immediately assume that every trait has an adaptive explanation. Just as the spandrels of St. Mark's domed cathedral in Venice are simply an architectural consequence of the meeting of a v
466168
because males MAY use them as stimulation receptors, they aren't ruled out by evolution\nso infact that are used, just not like females use them (think about it, if a male has nipples and uses them this way, then he would be able to spread his charateristic to more females thereby increasing the popularity and favorability of the trait)\nas for the question of why they there in the first place...\nits one of those characteristics that are kept when the baby is developing in the womb
846909
They don't. Both men and women have mammory glands.\n\n\nhttp://www.newsandevents.utoronto.ca/bios/askus18.htm