Structural development of the breasts will sometimes form hard tissue behind the nipples in both males and females, and is usually not a health concern.
it's called arousal. google it.
No, it doesn't. It means you are horny or you're cold, or you want to have sex or masturbate. It's normal.
The same way you make a guy's nipples hard.
If you mean that they are always erect it is normal and nothing wrong with you.
Nipples that are really hard are referred to as being taut. They can also be called stiff or hard.
This is normal for a boy in his early teens and it won't last long. Swelling around a boy's nipples is one of the several changes that come with puberty.See the Related Questions below for "What is puberty?"----
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.
Yes, they do.
Hard.
Genetics,,, I once had A girlfriend that had nipples that were undetectable without your eyes.
I think you are referring to Montgomery's tubercles. They are normal and may become more exaggerated with pregnancy. It is thought that they secrete protective substances to help prevent infection and to protect the delicate skin. You DO not want to try and get rid of them. Even simply squeezing them too hard can cause an infection. Be nice to your body, many people find those bumps to be beautiful. Nothing to be ashamed of most women have them.
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.