Fetishes are a big taboo in our society, so it's only natural that this appears in our media in some way. When the taboo aspects of a fetish are highlighted in a work of art, you have this trope. It is usually done to show that the character with the fetish is weird and creepy, and the surreal aspects of the fetish is a primary focus of the scenes it appears in. Often, the character is a villain. The key difference here aside from the specificity of the former is that there are no implications of danger in these fetish scenarios, while there is implied danger in BDSM scenarios.
For example, there isn't much that can "go wrong" in a foot fetish scenario. The character with the fetish is depicted as simply being creepy, gross, or pathetic, but doesn't necessarily have to be evil. This is also common for Corrupting Pornography , where any form of fetish porn will be the most corrupting. You'll notice that the majority of the examples below involve feet in some manner.
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This is because foot fetishism is easy to depict onscreen without being explicit, while still being recognizable as a sexual interest, making foot fetishism the go-to for establishing that someone is a creep with a weird kink. Ironically, anyone knowledgeable about sexuality will tell you that liking feet is one of the tamest fetishes there is.
See also Sexual Karma , which can overlap weird characters are rewarded by the story with weird, therefore kinky, sex. This trope is also distinctive from Author Appeal , where a creator's fetish purposely appears in their work, as this trope specifically centers on the demonization and mystification of fetishes.
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The fetishes do not have to exist in Real Life , but it has to be clear that the sexual interest is a fetish. At the same time, this trope also does not include every fetish, as some already have a trope of this nature. Bestiality, for example, is Bestiality Is Depraved. Along those lines, any paraphilia that is currently illegal or objectively harmful as in, any sexual interest that cannot be acted upon safely and consensually should not be added.
