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Is there a trope for a common Take That! towards fanboys being that they're interested in a work because they're perverts who are sexually attracted to the female characters? Or at least take the Wish Fulfilment aspect of the work in the direction of using it for sex?
The idea there can be that the character likes something terrible because he's not sexually active and the fandom is "filling a gap", or that he's so into the fandom that it's taken over even his sexual preferences.
Another thing that might be related is a character who's a creator being unable to keep his fetishes separated from his work. Usually that comes in the form of a director that starts acting creepy whenever he's shooting a sex scene.
Those are mostly comedy tropes but I've seen them around in dramas too - usually pearl-clutchy stuff about fans being unable to separate fantasy from reality.