I have a male cat who is neutered, but trys to hump my arms, and back of my head. Today he tryed to hump me, and I repetedly throw him off me. When he calmed down and lay in my lap, I thought he was finaly being a good boy, but when he got up there was a big spot of semen on my lap. He then jumped into my boyfriends chair and liked his penis that was sticking out. Can anyone tell me how to get him to stop this behavoir?