In this innovative, flashback-'80s-style horror flick, teenagers who have sex are hunted down by a nameless, faceless and completely unstoppable monster. The only way to fend it off? Pass the curse on to some other poor victim by ... you know, sleeping with them. It sounds outlandish, but writer-director David Robert Mitchell (The Myth of the American Sleepover) has crafted one of the purest, scariest horror films in years with this one. 100 minutes R.