1 word: disgusting, in a bad way. Awful pacing. Awful execution of what could've been a really cool plot. Horror version of Holes? Sounds awesome. But 70% of the book had nothing to do with the horror elements and everything to do with horny teenagers getting it on or wanting to get it on. I don't want to read that. I respect teenagers are hormonal, but there's a line.
Also? Why was everything described in a sexual manner? Even the weather. 
1 star for being bad. 1 star for being a good concept.