I want to know the name of this movie, but I only have a description of it.?

I saw this movie about a year ago and I cannot remember the name of it, or the actors in it. But I do remember the story line.. a couple goes camping in the woods, and a family that lives in the woods captures them. This family cannot conceive a child, so they try to force this couple to conceive one for them. It is a very gory horror film, and if you could help me figure out the name, I would appreciate it :]