To me, there's nothing hotter than a traditionally masculine man fully embracing being submissive. I get a massive charge from the mental image of bodybuilders and blue-collar workers (truckers and construction workers, maybe even cops) on their knees ready and waiting to serve. Seeing guys in their 50s and older enjoy being degraded and fully submitting to younger guys makes my cock instantly spring to life, especially if the roles are reversed where the older is the Good Boy and the younger is the Sir/Master. I understand that it completely fucks with the dynamic that's "supposed" to happen; but I'm a Dom that loves older men, so it just makes sense to me. Guys that need to be taken down a couple pegs like arrogant frat boys or high and mighty businessmen are also fair game (military men too).