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.
Ice...or cold objects
so there nipples go hard
Your nipples go hard.
they go hard and you blow your load.
Don't question it, just go with it
dont question it.....just go with it
Because women have the chills so sometimes the nipples get hard.
Yes, they do.
Nipples that are really hard are referred to as being taut. They can also be called stiff or hard.