Call it a paraphilia.
Most people won’t even know what that means.
From Psychology Today:
A paraphilia is a condition in which a person’s sexual arousal and gratification depend on fantasizing about and engaging in sexual behavior that is atypical and extreme. A paraphilia can revolve around a particular object (children, animals, underwear) or around a particular act (inflicting pain, exposing oneself). Most paraphilias are far more common in men than in women. The focus of a paraphilia is usually very specific and unchanging.