The ducts are always there.
TWEAK UM! When a woman is aroused her nipples harden. OR you could always turn down the heat cold nipples=hard nipples
Your nipples won't darken.
Without a third party, they are always aligned.
You grow a ballsack
It's all dependent on which race you are. Women from Europe tend to have pink nipples, while those from Africa or Sout America have much darker nipples. There are, of course, always exceptions to the rule.
Magnets always align in N-S direction because the earth itself behaves lika a huge bar magnet. The north pole of the bar magnet attracts the geographical south pole and the south pole attracts the geographical north pole. That is why magnets always align in N-S direction.
the size of blueberries and they're always hard
Because boys like boobs.
no, if u r cold your nipples tend to get hard. Women will most always get hard nipples when aroused and most men wont, but some do. if u r Mae and get hard nipples when aroused it doesnt mean theres anything wrong it just happens.
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alot of women do have inverted nipples and have always been like it but if they all of a sudden become inverted you should get this checked out by your gp as it can be a sign of breast cancer.