I Want You Inside Me is a modern twist on a horror classic. The film is a great take on the idea of a vagina dentata, at least in a loose sense.
Our protagonists first boyfriend disappears after the pair have sex in a cave. He keeps trying to call her, but something interferes with the sound. We don't really find out what happens until our protagonist moves on.
The whole thing could be looked at as a metaphor about giving in to your desires in case you'll be fully consumed.