For the same reasons as a males nipples go hard it is the result
of increased circulation of blood.
Most females nipples go hard when excited, cold or Wet. Dont know if that helped.
it's called arousal. google it.
they get hard, the same way guy nipples do when they get turned on.
There having "fun in the sun"
Yes they do but it does not mean that they are horny. Temperature and simulation of clothing etc. can make they get hard. It does not necessary mean she is horny. Some girls nipples are just naturally hard too.
When it's cold or they're turned on.
Nipples turn hard when you get cold or when girls really get turned on.
no girls dontt have dicks to git boners girls just git hard nipples
It is just their bodies response to stimulus such as arousal or temperature change. Men's nipples can do the same thing it is just not as obvious.
Because it is genetic, ony ten percent of girls have inverted or nipples that face in whereas the other ninety percent have nipples that go outward
so there nipples go hard
I'm guessing you are reffering to the nipples and for some women they do and for some they dont.
Their clitoris (analogous to the penis) becomes erect, and they also get hard nipples.
Girls have nipples from the time they are born, perods have nothing to do with them.
they go hard and you blow your load.