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 the crew behind the film decided he needed to be deformed. Victor Miller explained Jason was not meant to be a creature from the "Black Lagoon" in his script, and scripted Jason as a mentally disabled young boy; it was Savini who made Jason deformed. Ron Kurz confirmed that Miller's version of Jason was that of a normal child, but claims that it was his idea to turn Jason into a "mongoloid creature", and have him "jump out of the lake at the end of the film". Miller later agreed the ending would not have been as good if he