Everyone is aware of the sexual dynamic ascribed to vampire bites, correct? So when a male vampire bites a male victim that's disgusting shit. Male vampire bites female victim, I'm liable to get some wood. Male vampire bites male victim, I'm liable to hurl. That's why you seldom see the latter in film. It often happens, but it is seldom shown.
Don't even get me started on those plots wherein the master vampire will only allow the slave vampire to feed on rodents, and cats, and such. That sort of abomination is never actually shown on film, and we are the better for it.
My apologies. This has been bugging me all morning. I had to get it off my chest.