Depends on the ass and the person with it. Also depends on how hairy we're talking.

Had these pictures of this adorable Asian ladybody for a while, hairless except a landing strip and a little fuzz in her crack -- on her, it was kind of cute and while it didn't especially turn me on, it didn't repulse me. If she had a bear-ass covered in thick, wiry black hair, then that would have been gross.