Depends on the individual. Some men have very sensitive nipples and can be aroused by them. Some women don't have much feeling in theirs at all. Why do you want to know?
It probably depends on the "intensity" of the touch as well. Some like very ligh touch, some a more direct "approach". I know that hard pinching does nothing for me ( ouch ! ), but very light little touches....ooooooohhh la la !!! lol I guess it's the same for men...
Are all you girlies having a horny friday or something....first uniforms, now nipples...what's next (can't wait !!!!). I'll have to give my msn addy out so we can discuss this on a more personal level....lmao.
The answer for me is yes....love them being licked.
I know a guy whose got both his nipples pierced and he said when his girlfriend plays with them, he can practically orgasm just through the pleasure of that!
Men and women have the same number of nerve endings in their nipples. Nipples are like feet, the more pressure on them over time the less sensitive they get as the skin gets a bit thicker. This is why pregnant women who plan to breast feed are advised to touch theirs regularly to desensitise them for future problem-free feeding of junior.