Sex in film pursuing. In horror films, sex is often used to "mark" characters that are doomed to die. Characters that engage in sex acts are often the first to be claimed by the antagonist(s), or will die shortly after their sex scene or (sometimes) in the middle of it. This convention of it being bad luck to have sex in a horror film is notably illustrated in the "Friday the 13th" film series, where supernatural villain Jason Voorhees takes a special dislike to teenagers and young adults having sex because, as a young boy, he drowned in a lake while the camp
Jason Voorhees Jason exacts revenge on Alice for decapitating his mother in the original film. Jason (Steven Dash and Warrington Gillette), returns to Crystal Lake, living there as a hermit and guarding it from all intruders. Five years later a group of teenagers arrive to set up a new camp, only to be murdered one by one by Jason, who wears a sack over his head to hide his face. Ginny (Amy Steel), the lone survivor, finds a makeshift shack in the woods with a shrine built around the severed head of Mrs. Voorhees, and surrounded by corpses. Ginny fights back and