why do nipples split apart?
926940
they are dry, rub cocoa butter on them or use a product called Mothers Friend.
392368
Men's nipples don't have a purpose.  When a baby is developing in the uterus, they all start out as female, hence the nipples developing.  Basically in order for a male to develop from there is a genetic fluke which sends signals to start developing male organs.  The only sign that is left that all men started as females at the most basic level of life is the nipples.\n\nFascinating, huh?
1144209
psychologically, the nipple represents the breast, and they do not look completely topless unless you can see the nipple. same reason you dont notice a womans breasts as much untill her nipples get hard....you ate from them for a long time as a child, they hold fasination
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.
91408
Mammillae are standard issue and develop before the sex chromosomes x and y kick in.\n\nAnd that's why men have nipples.
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.
482421
Usually nipples get hard when you become arroused or in laments terms "horny". The blood flows into your breast and then into your nipple. Your nipples can also become hard if you are cold. I hope this helped.
1009553
It is not normal to have fluid leaking from your nipples if your not pregnant,you need to go see your ob/gyn to have it evaluated.
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!
606437
If this is due to breastfeeding then you need something that will not harm the baby.  If you go to your pharmacy you should find a few creams in the baby aisle for this.  The best bet for cracked nipples due to breast feeding are nipple shields.  They are very, very thin silicone cups that cover your nipple and part of your breast so the baby can still breastfeed normally and you can heal.\nIf on the other hand it is not due to breast feeding then you need Lanolin cream to lock the moisture in.
1167832
because while you are developing intruterine, you r sex could go either way, until the correct signal is interpreted that now tells you whether you will be male or female.\nthat is when the body parts start to differentiate....\npenis becomes clitoris, testicles do not descend and become ovaries, the scrotum stays split and becomes the labias...nipples will stay, they will not just disappear
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.
124916
I agree with Harley.  It has happened to me, and once a tiny drop of liquid came out. This hasn't happened again.  But a male nipple can get stimulated and tender.  A basketball jersey may have been moving up and down on it, stimulating it.  It is totally normal.  It just means your nipps can be stimulated.  Depending on what is happening with levels of hormones and cycles, your nipple can become more sensitive than it normally is.
1164409
The same reason little kids can go topless.  There is nothing to see.  You see, a woman's breasts are a private, personal thing.  They are all different shapes and sizes, the nipples are MUCH larger than men's (in most cases), and they are used to feed children.\n\nPlus, think about how much you stare at men's pecs compared to how much they stare at your breasts.  Do you really want them to be able to see them any time?
446999
why do men have nipples?
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
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