my neutered male cat Dusty likes masturbating. He has been neutered since he was a kitten. He climbs on my lap or bed or blanket and starts to move as if he was having intercourse it seems to work for him... i dont wish to mean to him but it causes a really bad smell. he has been doing this all along since he was a kitten but now he seems to be doing it more often. He does not display any other signs like spraying or chasing female cats although there are female cats around. I would really hate to have operated on again. He is a really nice cat besides this problem.
