guilt lust

When you find yourself sexually attracted to someone/something that would not usually be considered attractive, and in most cases is usually seen as rather unattractive.

Jan: "I can't believe I'm saying this but..."
Dan: "What?"
Jan: "I watched Beetlejuice the other day and he's kinda hot..."
Dan: "Seems like you've got a guilt lust...I feel the same about the Grudge."
Jan: *laughs* "What the fuck even Dan..."