Mine have never been very sensitive, but I know it varies from person to person. Supposedly piercings will make them uber sensitive, but I have no intention of finding out. I had an ex-girlfriend who tried to get me to have my nipples and navel pierced, since she was really into that sort of thing. But I knew if I did, it would only be a matter of time before I snagged it on something. That concern was drilled home years before on a deer hunting trip. One of my amigos had nipple piercings, and our day pretty much came to a halt when he screamed in agony while we were pushing through the trees. A branch managed to tear one of his rings out. He got to spend the rest of the trip with an adhesive bandage where his nipple used to be. Being the empathetic souls we are, we referred to him as "Nips" as for months. So when the idea was proposed years later that I get piercings, my reaction was "HAHAHAHAHAHAHAHAHAHahahahaha.....no. I'll retain my dull insensitive nipples thankee."