" In the strict, psychoanalytic sense of the term, fetishism is a disorder in which a person, usually a man, can only be turned on by an object associated with the opposite sex, generally either an intimate article of clothing—shoes, bras, panties, nylon stockings, etc.—or a specific body part, most commonly the feet. The fetishist is so fixated on the object itself that the actual sex partner becomes secondary. That is to say, a male shoe fetishist will be more aroused by his girlfriend’s spike-heeled footwear than by the woman herself. According to the American Psychiatric Association, “The person with fetishism frequently masturbates while holding, rubbing, or smelling the fetish object, or may ask his sexual partner to wear the object during their sexual encounters. "

― Harold Schechter , The Serial Killer Files: The Who, What, Where, How, and Why of the World's Most Terrifying Murderers