Why does a male human-being have nipples?
148521
all people are female in the womb and at a certain time they change to male or female through a set of biological conditions,nipples are a remnent of when we were a fetus
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.
223449
Because they haven't quite finished evolving yet! Back when we were apes, every once in awhile Mama ape would go out with all of her girlfriends to the local cave tavern. Papa ape had to stay behind and feed Junior ape. Since there was no Mama ape around, and no milk man delivered any freshly squeezed milk from an anklysoaraus, then Papa ape had to resort to using his own nipples to provide Junior ape with the nourishment he needed to be a big strong hairy caveman.\n\nThe real answer is, because God created man with two nipples. End of story.
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.
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.
239458
Men are cut from the same mold as females.  Men HAVE nipples in order for women, who need them, get them.\n\nYeah, yeah, but that is all I got!
11108
We are all mammals, and a mammal is defined as an animal having mammary glands (and nipples), pentadactylic limbs, hair, and give birth to live young.\n\nMen have nipples because we have mammary glands, although these are underdeveloped in Males due to the lack (or controlled amounts) of female hormones such as osteogen in our bodies.  Males exposed to large amounts of female hormones have been known to develop breasts (enlarged mammary glands).
265525
Nipples are not too much attractive as the whole breast are.But its very sensitive,so it should be covered for its sensitivity.
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
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...
62582
Many scientists believe that male nipples are an evolutionary vestige which is simply the result of males and females shareing virtually identical genetic structures.  Some evolutionists belief that evolution has not phased male nipples out because there is no evolutionary advantage to phasing them out.  Also, male nipples do serve a limited function in sexual arrousal.  Further still, male lactation does occur, though rarely, and is no doubt the result of the simularities in the genetic code with females.
186970
A proper answer and a real one is that Allah has never put anything in a human without purpose, and I think the purpose is to have a sensitive area in your body so that u could feel changes surrounding the body(you could note the changes happening to the nipples skin when touching them or when it's cold and in normal situations), you could also have more sexual excitement with them than without them.\n\nAnother answer as we say in Egypt is that some silly *$*&^%(& boy would pinch them and tell you Ew3a weshak. LOL!!
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.
91408
Mammillae are standard issue and develop before the sex chromosomes x and y kick in.\n\nAnd that's why 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.
277841
Mmm some very daft (but amusing) answers to this one. The real reason is all embryos start out female until about six weeks when the male sex chromosome kicks in for a male embryo. The embryo then begins to develop all of its male characteristics. Men are left with nipples and also some breast tissue.
989312
first, human male nipples are not useless, nor are they "vestigial" (more about "use" in a moment)\n\nto answer the latter part of your question...yes!\n\nmales actually can lactate under certain conditions (stress, medicinal/hormonal stimulation, and others); males do have, unbeknown to many, mammary glands\n\nbut male lactation is an unusual, rare event\n\nand human males would not be able to produce the quantities of milk needed to adequately nurse offspring\n\nthe primary purpose of the human male nipple is to serve as an erotic stimulus\n\nthe very first command that god gave to man and woman (adam and eve) was reproduce and fill the earth (ie, have sex and make babies)\n\n(of course the sexual relationship was always and only intended to be addressed within the marriage relationship...on the other hand, neither was it intended to be limited to some simple act of nothing more than making babies; it was also intended for pleasure according to the "song of songs"\n\nin the physically fit male, which men were originally intended to be, the nipples serve to sexually stimulate the female when they gaze at their husbands while working or relaxing; they also serve to sexually stimulate the male when his wife offers manual or oral stimulation\n\nin short, the primary function of male nipples is to serve as an erogenous zone (through visual and/or tactile stimulation)