we got Monty neutered when he was at 6 months. we were unsure about whether or not we wanted to, but his humping was getting out of hand...he had a favorite teddy bear, and he would spend hours with it. We thought it was fine, until he got umm...a little too dry, and things wouldn't go back where they were supposed to? Not sure of the medical term! but, it ended up being an expensive lube job from the emergency vet! Since then, there has not been much change in him. He still humps teddy bears if he can find them, and it's been 4 months.