Not to mention the parallel to long term prison incarceration, animal in zoos exhibit very similar behavior. In the wild if the dominant male won't let another breed then it's up to that male to leave the heard or remain with the boys. In no way does that prove that out cast males are sexually attracted to each other, they're just doing a form of masturbation, in lack of a better term, "wet dreams". It's no different than a dog "humping on legs".