exophilia exophilia exophilia is "a fetishism whose object is the sexuality of extraterrestrials." in other words, it is a desire for extraterrestrial, alien, or other non-human life forms. the term was coined by the writer supervert in the 2001 book extraterrestrial sex fetish. because exophilia originated in a literary work, it is not a paraphilia recognized by experts such as the american psychiatric association in its diagnostic and statistical manual, fifth edition (dsm).