It Follows (2015)

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Jay (Maika Monroe) is a high-school student who has just started to date a nice enough guy called Hugh (Jake Weary); the rest of the time she hangs out with her sister Kelly (Lili Sepe), Yara (olivia Lucccardi) and a shy childhood friend called Paul (Keir Gilchrist) who has long had a hopeless crush on her. Jay´s normal sex life takes it´s normal course, but then she finds out, too late, that she has been inducted without her knowledge into a supernatural death cult. The sex act means that she will be followed, at a zombie´s walking-pace, by a demon that only she can see, and which will kill her. The only way she can get rid of her pursuer before this happens is to have consenting sex with someone else, and so pass the curse on to them.