Underwear fetish: the fascination with underwear, usually women's underwear. Men with this fetish will collect, wear or smell underwear.
Uniforms: Uniforms, of course, can make someone seem like a powerful person (military, police and firefighter uniforms are some of the most popular) or help you get into the role of a naif (schoolgirl, waitress/waiter, Playboy bunny) and a well-fitted uniform shows off a person's body in just the right way. If your job requires a uniform, you're in luck. Otherwise, you can hit up a costume shop or even buy uniform-inspired lingerie.
Ursusagalmatophilia: kink for teddy bears or dressing up as a teddy bear/animal.
Urtication: using the nettle plant to sting a partner's skin.
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List of Kinks/Fetishes (A-Z) + bonus information
Non-FictionLiterally what the title is, obviously has mature themes, be advised. If I miss out on anything, please message me so that I can add to the list.