Um... depends on the cats. I once called my vet and asked him if he was SURE he had done his job because the cat was "taking care" of all the girl cats. My vet laughed and gave me some hormones to settle him down, but Panther lived 16 years being a poster child for safe cat sex... Maybe my cats are just a sexy bunch, but they all play at it for what seems like some of the same reasons people do. As everyone here is fixed, I figure it makes them happy and does no harm, nobody fights or forces (and the only one who sprays does it clearly over territory), so what's the problem?