Just saw a movie based on a Jack Ketchum novel and I think it may be right up your alley.
It's about a dad who goes out hunting and discovers a feral woman out in the woods so he decides to bring her home to his family in an attempt to civilize her. It's not disturbing in the way that Serbian Film or Martyrs was but more in the same vain as The Girl Next Door.
Here is a link to the IMDB page.
http://www.imdb.com/title/tt1714208/