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Vampires are, traditionally, bisexual in the sense that they seduce both genders in order to suck their blood. I almost think I have heard the slang before, but I can't recall where. And it is odd that there's like zero confirmation of it anywhere online, so I might just be imagining that I heard it.
Its not that they like to suck on things. That's like the juvenile, "Hur hur I made a gay joke" thing.