Why do males have nipples?
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
1090708
Men have nipples because all humans start out female, and only later in development do males differentiate, change, and develop the characteristics that make them uniquely male.  If you examine a scrotum closely, you will notice a seam that runs down the middle of it – this is because the tissue that forms the scrotum in a male, is the same tissue that forms labia in a female.  Few people, particularly men, recognize this, but a clitoris, the sensitive part of the female genitals becomes hard when a girl is aroused – I am certain that is not just a coincidence.  Ovaries and testicles are also two different finished products that our bodies create out of the same tissue, depending solely on gender.\n\nSo men’s nipples are a relic of a time before birth when boys were girls.
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.
430549
In the womb a fetus develops as a female. At a certain point a chemical is relased determining the sex of the child and the reproducetive organs form, however the baby has developed nipples before this point. Another argument that girls rule ok!
86883
b/c we all start out as females.... males retain some characteristic such as the nipples.\n\nthe purpose?.... a focus point to look at when your chillin by the pool in the summer with swim trunks on
3475
Because in the womb, we develop equally until a certain point where our respective genders become more apparent. The period before this is when men grow nipples.\n\nBesides, can you imagine life without your nipples? A bleak world indeed.
602450
Without Nipples the Male Chest Looks Strange.  The nipples provide a focus point for the male chest. They direct the eye to the curve of the pectoral muscle. \n\nMen 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.\n\nInsufficient or defective testosterone, poor tissue responsiveness, or an unbalance of other hormones like Estrogen and Prolactin can cause female like breasts even in men (Gynecomastia). At birth, the small amount of the mother's estrogen in the baby can result in small breasts that usually resolve. There can be an inbalance of hormones during male puberty that can result in temporary breast growth, which for most resolves. There are many medical problems and drugs that can cause male breast growth. \n \nThe nipple is actually the central protrusion inside of the pigmented areola. There is a thin muscle just under the skin that when stimulated, tends to flatten the puffed male nipple areola. This muscle when stimulated in a breast feeding woman, projects the nipple for the baby. Nerves that innervate the nipple / areola can produce pleasure for both men and women.
516739
I hope you mean why do men have nipples, because women obviously have them to feed babies, \n\nMen have them because they are part of our common traits between male and female.. evolution will take care of men's nipples at some point since they serve no purpose.. just as the appendix is going away
128418
Every animal comes from a "generic" base model.. the "Y" chromosome chooses to make that base model male.  All body parts translate into some part or another between the two sexes.  So, men AND women therefore have nipples.
867768
Answer this.\nWould you want to be showing your breast?\nAnd men dont have breasts. They have chests.
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
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.
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.
358587
'Male and female human embryos are identical in the early stages of their development. If the fetus receives a Y chromosome from its father, a hormonal signal is produced: the labia fuse to form a scrotum, the gonads develop as testicles and a male results. Otherwise the "default" female remains.  Various structures in the adult reflect the symmetry of male and female and their common embryonic source. Men have nipples because they have already begun to develop when the "switch to male" signal is received. The development of breasts is halted in most--but not all--cases but the nipples are not reabsorbed.'
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
184664
Nipples are an erogenous zone for both men and women.
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.