Those with spectrophilia report a sexual attraction, relationships, or sexual encounters with ghosts who come and have hot sex with them at night. A succubus is a ghost in lady-form that, in folklore (or a spectrophilia fantasy), visits her object of desire at night for some hot human/ghost lovemaking. An incubus is the male variety (and also that band). The sexual attraction that spectrophiles report feeling is as real as any other fetish.