Because they are hot?
Yes, when its cold or when you have goosebumps it gets darker. I'm fair skinned with light brown nipples-perfectly normal.
Black women don't 'have' their nipples black. Your wording this as if if we're a choice. The nipples on any person of color wether light skinned or dark skinned will always be darker than most of their skin tone.
No, most people have nipples that are darker(if only slightly) than the skin. This doesn't mean anything is wrong with you though. My friend's nipples are like that. Don't ask how I now :)
There isn't one. its ok if you have brown or pink it doesnt really matter.
Brown
Brown.
yes, they are brown instead of pink as before childbirth yes they are brown instead of pink as before childbirth
i personally like brown nipples they are more appealing (they turn me on) but you have to be tan.
Brown
Brown is the more darker color because of its texture. Just like a tree is darker than grass.
There are many shades of both color, so it would depend on what shade. Generally, I assume brown is darker than red.
Old nipples are dark brown and rather wrinkly whereas young nipples are pink or very light brown, plump and wrinkle-free!