As a bi guy, I'm crossing my fingers for twinks and femboys, personally. All the current stuff in the game for a male player character mention stuff like stubble and whatnot. Not everyone is into bears.
Would you tie them to personalities/body types or something else? Granted that most gay """classes""" differ based on muscle mass, body fat and bodyhair, maybe making Muscle (separate from fitness) and bodyhair an actual variable that can be represented in the texts and sprites would work? Makes sense since trans characters are coming too!