why men have Nipples ?
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.
645957
All human embryos in the womb look the same externally, until testosterone is either added or not.  If not, the baby will develop physically as a girl, if the testosterone is added, the baby develops physically as a boy.  This is true regardless of the XX or XY chromosome of the baby.  The nipples develop prior to the addition of the testosterone.\n\nThey are there because the child could have developed as a woman, and the only purpose that I can think of that they have for men is perhaps a little thrill when your lover pinches them. :)
126625
Where's your evidence?\n\nWe all start out female (that's the reason guys have nipples). The gender gene kicks in later and we develop into males and females. Suppose any genetic or hormonal conditions which lead to homosexuality kick in after gender is determined? There'd be no more reason to think that ALL women would therefore be bisexual than there would be to say all men were bisexual.
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
126709
instinct..man's primal desire for breast...the sucking stage' in psychology.Get turned on big boobs because they are easily seen. But we can still be turned on even on small breast.Remember men are visual. There is rise on blood pressure..heart is pounding.
40121
Men and women both start out the same.  We all have the same parts.  Eventually, men develop testicles and they descend.  Women develop ovaries and they remain in the abdomin.  But by then we all have nipples.  The ovaries produce chemicals that turn those nipples into male enticing and baby fueling glands.  For men, they remain as useless as the day they were born.
2744
When a child is conceived, it is firstly a girl. Later in its development it can turn into a boy. So the male nipples are probably a remainder of the girl he used to be when it was an embrio.
47910
actually, I think men were given nipples, so they have something to play with in case they loose their balls
168127
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\nAs you may know, every human being gets a unique set of 23 pairs of chromosomes at conception. These fall into two categories. One pair of chromosomes determines sex--the XX combination means you become female, the XY combination means you become male. \n\nThe other 22 pairs, the non-sex chromosomes (they're called autosomes), supply what we might call the standard equipment that all humans get. These 22 pairs constitute an all-purpose genetic blueprint that in effect is programmed for either maleness or femaleness by the sex chromosomes. The programming is done by the hormones secreted by the sex glands.\n\n\nWebMD\nMales and females, though very different, have a great deal in common. In the earliest part of our embryonic development, we all start out much the same. Though the sex of an embryo is determined when sperm meets egg, the genital anatomy of males and females cannot be visually distinguished with the use of ultrasound until the 15th week of pregnancy. \n\n\nFrom the beginning, we all have the tissues that later develop into functioning parts, depending on whether we are genetically coded to be male or female. (The genetic coding that leads to people who have both male and female anatomical traits is much more complex than we'll get into here.) \n\n\nMales have nipples because they develop with the capacity to be female should their chromosomes dictate. Females call upon this capacity when they hit puberty and their breasts develop. Later, if they become pregnant, they call upon it again as milk is created in their breasts. Generally, males do not have a reason for the nipple to function, although, from time to time, adolescent and adult males develop a condition called gynecomastia, in which hormonal levels fool the breasts into beginning to develop. \n\n\nBut for the most part, nipples are on men's chests not for ornamentation, but because we all initially originate from the same kinds of tissues. Males just don't need their breast tissue to be a functioning part of their anatomy
86011
Males also have the hormone estrogen. Estrogen menlarges breast size. Women have more of it, so they have bigger breasts. They also have luteniezing hormone which produces milk for mammary glans after giving birth. Men do not have that. Women displaying male qualities like beards have an excess of testoserone and androgen
546211
When we are concieved the chromosones dont distinguish between male and female until after the nipples have started to develop.\n\nWith women the cells continue to specialise and produce breast tissue with men they don't.
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
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...
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.
360707
Actually yes you can. I don't have sources but I do remember hearing about this back in high school from one of my teachers how a tribe of indiginous people of South America that kept injured men of the tribe useful by having the babies breast feed from the men. If enough suckling action is applied to the nipple, a man's body will actually begin to produce higher levels of estrogen and provide small amounts of milk. \n\nAccording to the study, it took a very long time and would probably not work for other people but since this had been a long practice of the tribe, it worked for them.
1183966
For modesty, to keep men from being turned on all the time.  A lot of men stare at at a woman's breasts instead of looking at her face when talking to her.  Even if they don't keep staring, that is usually the first thing a man looks at when looking at a woman.  So we are doing the world a great favor by keeping our nipples covered!  Not much work would get done by men if they saw nipples everywhere!
122739
Men have penises for a few reasons.  Firstly, so they can pee.  Secondly, so they can deliver sperm to an egg to reproduce children.  And finally, so they can give and experience sexual pleasure.