We don't. They get hard when it's cold or some women get hard nipples when they are aroused. Same reasons some men have it actually.
Most females nipples go hard when excited, cold or Wet. Dont know if that helped.
Nipples turn hard when you get cold or when girls really get turned on.
it's called arousal. google it.
Depends what you do with them and how sensitive she is. Some have soft nipples and others hard. Contrary to what many believe, the nipples does not have to be stiff when she is aroused.
Girls have nipples from the time they are born, perods have nothing to do with them.
Yes you can some girls like there nipples sucked on some don't you can
The same way you make a guy's nipples hard.
of corse
Nipples that are really hard are referred to as being taut. They can also be called stiff or hard.
The nipples get larger so as to better suckle the baby.
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.