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If you have sex, you die. In teen horror movies, those who couple off for a lusty moment or two usually end up losing more than their shirts. Friday the 13th features an entire cast of randy teen camp counselors who are dismembered one by one as they sneak off to earn the film its R rating, most only living a few minutes past their trysts before they’re greeted with an ax to the face. If you want to up your odds of survival, keep your virginity intact and your clothes on. As Psycho proved, even showers aren’t safe. Best to bathe clothed.