Spectrophilia, is described by Wikipedia as the sexual attraction to ghosts or sexual arousal from images in mirrors, as well as the phenomenon of sexual encounters between ghosts and humans.
A quick and easy search shows us that many people claim to have had these encounters, and seem completely convinced of their experiences.
If someone walked into a psychiatrists office with these claims, (assuming they are seemingly normal otherwise, and have no history of mental illness), what would they most likely be diagnosed with? And what medicine might they be prescribed?
Things we're assuming to be true:
Ghosts aren't real.