This slow, awkward, and uncomfortable film purports to be a horror and thriller. It is neither. It's about a grown man having sex with his pubescent niece. She is written to be the pursuer (as if that should make the situation more acceptable to the audience somehow?) and he is written to be conflicted. The conflict being: is he sexually interested in a child because he's mentally ill, or is it just the virus he contracted from a conch shell? (Insert eye roll here.) That's the mystery we, the audience, are presented with throughout the film and left with by the time the credits roll. So, with absolutely no resolution, it's a _bad_ mystery at that.
TL;DR: You'll be mad you wasted your time on this gross nonsense.
TL;DR: You'll be mad you wasted your time on this gross nonsense.