I have an almost 4 year old neutered male, he grew up with my other 4 year old fixed female.. they were the best of friends, never saw any affection between them. Until recently, we rescued a male kitten. He's now approximately 8 to 10 months old, hes still a kitten. We got him neutered right away. The last few months i've noticed bumps around the kitten's neck, like bite marks or whatever. lots of them. I didn't really think anything of it, i thought they might have gotten into fights but they've been fine. anyway, just tonight i walked into the bedroom and both cats were on the bed. the kitten was in an weird awkward position, he up and ran out as soon as i came in. i walked over to tommy, the 4 year old.. rolled him on his back to rub his stomach and then thats when i saw it sticking out.. does this mean he and my 8 month old baby is "sexually active" even though they both are neutered?