Dead Wood (2007)

Fergus March, Emily Juniper, John Samuel Worsey, and Rebecca Craven are four youths who head into the woods for a weekend camping trip in the British fright flick Dead Wood (2007). When they meet a mysterious young woman (Nina Kwok) looking for her missing boyfriend, strange things begin to happen and they start disappearing one by one. But(t) before that happens, Nina goes skinny-dipping and gives us a far-off look at her naked ass. That will give you wood!