This is why you should always think about protection! This story is about a demon, who happens to be sexually transmitted, and keeps following you annoyingly slowly. Thank God it won't use any public transport or vehicle, so if you drive for 3 hours, you can rest for 12, till it reaches your location on foot!
This incredibly bad movie from David Robert Mitchell, with it's unsubstantiated 6.9 IMDB rating reminds me to another STD movie, the Contracted, which seems to be more interesting, but disguasting at same time:
Protection girls, protection!