why do men have nipples?

Answer 1

All humans begin life in the womb as females. If no Y chromosome is present in the foetus, then the embryo will continue to develop as and be born as a female. If there is a Y chromosome present in the embryo, the male sex hormone testosterone restricts the full development of breasts to just nipples, the labia fuse to become the scrotum and clitoris develops fully to become a penis. If the Y chromosome prevails in producing a male, this is not done without a fight. Male babies are weaker as a result than female ones, occounting for the slightly higher death rate in male babies.

Answer 2

There are basically just a few periods in life during which sexual differences develop. But first, DNA.

It's worth noting that there is only ONE gene that determines gender. Don't think that this gene causes the hundreds of differences between men and women directly - instead it turns on and off other genes. This is an important point. Everyone has the necessary DNA (with the exception of that one gene) to be completely male or completely female.

The very first time that one sexual gene is activated occurs in the womb. Before this, there are no gender differences. Because it is a gene that causes 'maleness', the 'default' condition of a fetus is female before that point. Genitalia develop differently after that point and make up what are generally called 'primary sexual characteristics'. These are the things that make a boy different from a girl... not necessarily the things that make a man different from a woman.

The latter distinction is an important one. Since, as we mentioned, everybody has all the DNA to be either female or male, many of the things that both boys and girls have are just a set-up that only one of the genders will take full advantage of. That happens in puberty. Then people develop what are called 'secondary sexual characteristics' - those things that distinguish a man from a woman.

So men have nipples, and even milk-secreting glands, but only women generally make much use of them. Still, enough hormones can mess any of nature's plans up from time to time. Newborn babies, for example (even male ones!), sometimes secrete milk as they are awash with the hormones of being born (it's colloquially called "witches' milk"). And sometimes an irregularity in the womb or in puberty can cause someone who is genetically male to never develop a penis, or someone who is female to put on muscle and grow facial hair instead of menses.

It's probably a lot more common than you think. But men have nipples so women can have breasts (and even men can have them too, if they try hard enough).

Answer 3

We don't begin life as females. We begin life sexually undifferentiated and become female unless certain influences are present. Men have nipples because evolution preserves developmental pathways.

Male mammals have nipples because females need them-and the embryonic pathway to their development builds precursors in all mammalian fetuses, enlarging the breasts later in females, but leaving them small (and without evident function) in males.----Stephen Jay Gould

Answer 4

It isnt because everyone is concieved as a female. Its because everyone is concieved the same (neither male or female) and its not until later on in development that the sex of the child is decided. By that time the nipples are already formed.

Answer 5

embryonically everyone has the same body dtrusture as a mammal
when the sex organs are formed they define your gender but your nipples stay put
they arent absorbed by the body

Answer 6

In the womb, before we all develop features we are defined as female. We get exposed to ALOT of estrogen and so grown nipples.. then i think in the 2nd trimester, the male chromosome creates testosterone and it starts to kick in and we start developing male genitalia, but our bodies have already started to develop in a female form, and that's also why ours are smaller, as they stop growing when females keep on growing.

Answer 7

somebody once asked my latin teacher that. What a weirdo.

but yeah its because we all start of as female, and then later on in the womb, if you have xy chromosones you are turned into a male or something like that.

Answer 8

because everybody is concived as a female, than men change later in development but keep the nips.

Answer 9

yes I have seen them. They differ from male to male and some are inverted in the same way females have inverted nips.

Answer 10

initially humanbeing is categorised in the part of mammals ,
and not just women !!

also , nipples and its cementry makes beauty for men .