Sexual stimulation is one way, and another would be that she is cold.
Everyone is different. When you are young your nipples may be hard a lot of the time. As you get older your nipples tend to become hard only when you are cold, wet or sexually aroused.
It means you're horny or have chills.
Because you're horny?
The same way you make a guy's nipples hard.
Nipples that are really hard are referred to as being taut. They can also be called stiff or hard.
you can either lose or gain sensitivity; your nipples may or may not be hard all the time; they may get a little darker, just the nipple part. and some people are really different, so it can go anyway at all, really.
Yes, they do.
Hard.
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.
Genetics,,, I once had A girlfriend that had nipples that were undetectable without your eyes.
It all depends on the way your nipples were made!some are squished in and some are pointy!if your nipples are pointy it doesn't matter if they're squished in that's fine too!
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.