Thurston works from home, yet twice a week he travels downtown specifically to board the crowded subway trains shuttling people home from work and school. He waits until he spots a young unaccompanied woman holding onto the pole in the middle of the subway car. He then positions himself behind her and allows the bumps and movements of the train to conceal the rubbing of his genitals against the woman. Thurston derives intense sexual arousal from this activity. What paraphilic disorder does Thurston have?
◦ Voyeuristic disorder
◦ Exhibitionistic disorder
◦ Frotteuristic disorder
◦ Fetishistic disorder
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