My first cat liked to bite. He did it in play, but he would bite too hard and really hurt me. I couldn't break him of it. He continued to do it after he was neutered. When I was changing he would jump up and bite my bare butt, which really hurt. So I shut him out of my bedroom when I was changing. He ran away after a little over a year. I was sad at first, but now I have a much nicer cat and I don't miss the first one. The current one is very affectionate and when he nibbles he does it gently.