Because when we're still fetuses, all humans start with just one x-chromosome. Only when the second chromosome expresses itself is our gender determined, including nipples becoming mammary glands in females, or simply leftovers from the first four weeks in utero when we were all the same.
The primary formation of mammary glands and tissues are seen across various mammalian species and begin to form early in development. This means before the gender-specific processes, such as the expression of a second X-chromosome if you're female, or a Y-chromosome if you're male, take place.
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Cause you were born that way
Because they develop before the chemicals that are released that select sex.
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All fetuses start off as female, and later in development (by the first trimester i think) the Y chromosome kicks in and causes your uterus, YEP YOU HAD ONE, to move out of the body cavity and form your junk. Your balls were once ovaries, your dick was once a uterus, and your nipples had the potential to produce milk.
You were female before your gender was decided basically. That's why we all have it.
cause you were once a female in the womb, but later in development in the womb you became male.
I think men may have them so their girl can get a brake from having hers played with
because nipples are cool...
cuss u do u would look wired with out them
Because it's part of the human body
I dunno you might be dying or something
You started out as a girl
Long story short: You had a sex change
Because we all start off as girls...
I have no clue
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