Lace Crater follows the story of Ruth (Lindsay Burdge), an awkward twenty something that begins to experience strange physical changes after a weekend tryst with a ghost. The phenomenon of sexual encounters between ghosts and humans is called spectrophilia, and there are some films that have explored this phenomenon in the past. While not exactly a trope explored often, the relationship between humans and ghosts is one that can produce either romantic or terrifying outcomes.
Ghost (1990) is perhaps the most famous example of a romantic haunting. While no actual human-ghost sexual encounter occurs in the film - the famous pottery scene occurs at the beginning of the film - Sam Wheat's (Patrick Swayze) love for Molly Jensen (Demi Moore) is so strong that he watches after her to protect her after his murder.
The Entity (1981) is a film that is the exact opposite of a romantic haunting, and Martin Scorsese considers it one of the scariest horror movies of all time. The film stars Barbara Hershey as a woman who is tormented and sexually abused by a ghost. The film is based off the story of Doris Bither, a woman who in 1974 told Culver City, California police that she was raped by invisible assailants.
Last year's hit Midnight Madness film It Follows (2014) doesn't feature a human-ghost sexual encounter, but it does feature something arguably scarier - a sexually transmitted poltergeist as programmer Colin Geddes put it in last year's programming notes. The film follows Jay (Maika Monroe) as she confronts a murderous entity visible only to her after having sex with a new boy she has been seeing.