What makes women's and men's nipples hard?


Question:
I know arousal, cold, etc.. what makes them hard pertaining to bodily functions?

Answers:
Nipples have erectile tissue in them.
this happens to me when my man messes with them. I think that it is some form of showing you are sexually arroused. Also when you get cold.
cold, sexually aroused or have something (like a shirt) rubbing against them.
cold air
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