Why Is My Neutered Male Cat Humping and How Do I Stop It? PetHelpful When Do Male Cats Become Sexually Active? Vet Reviewed Signs & Recommendations Catster How to Tell if Your Cat is Male or Female Please help. Is my cat masturbating? He does this all the time. If you look, his back rump is hunching on the blanket. I got him when he was 2 already spayed. Ive never had any other cat do this.