Partial synopsis from BoysOnBoysOnFilm
At first, young, girlish-looking Norio doesn't understand why everyone around him seems to have the hots for him Ð schoolmates and even strangers on the train are constantly trying to touch him. When he stumbles down a flight of stairs, right into the arms of sexy older student Kunimasa, Norio learns the truth: he's a member of Zoomanity, and in fact, one of the rarest breeds of all. Kunimasa, naturally, is a Zooman evolved from a leopard, and is determined to not only make this rare species his own, but to actually mate with Norio and impregnate him! Since Norio hasn't been raised among his own kind, he has no idea what's going on around him. Enter Yonekuni, elder brother to Kinumasa, and self-professed hater of men. Luckily for Norio, he's girly-looking enough that if he puts on a skirt, Yonekuni can stand to be in his presence, and agrees to tutor him in the ways of Zoomanity. At first, Norio wants nothing to do with Kunimasa's cold and calculating behavior, but something about Kunimasa's scent draws the newly-awakened cat-boy closer to the leopard-man who's claimed him.
Curious, but too embarrassed to check out the manga? Well, you're in luck, as apparently an animated OVA of Sex Pistols is headed our way this Winter. I mean, its less weird to watch leopard men fondle cat boys... then read about it... right? I think I saw that last week on the Discovery Channel.