Perceptive forum discussions on Nipple vibrators:

Do You Like Nipple Clamps?
I'm just wondering if anyone else likes their nipples tortured, as my friend just put it. Personally you could attach a chain to mine and yank them...

Nipples Question : What would you do if...
What would you do if you're in the heat of the moment, and discover your partner has no nipples? (hypothetical situation)

Do nipple clamps hurt?
do nipple clams hurt the name just sounds better

Best types of nipple clamps?
Do you like the kind that vibrate or the kind that hang and dangle? Do you like fancy ones or plain ones? light ones or heavy ones? Boy do i love...

Nipple piercing and clamps?
I love nipple clamps, but just recently got my nipples pierced (to add options to play!). My partner and I got into a debate today, when the...

As long as you go to a skilled piercer and take care of them, you should be fine.

Here's some info.

Some people I know find it makes them too sensitive, but you can always take them out (though the nipples may always be more "erect" than before).

The thing to watch out for is mastitis (warning, pictures), a nasty infection that can lead to severe complications. It's rare, though and more likely if you're pierced in the areola instead of the nipple itself (which is why going to someone skilled is important).