What movie has a pregnant woman in the woods, but she only looks prego cause she prays on men.?

The woman looks pregnant because the men she sleeps with get sucked
into her body. She then pulls bloody clothes from her and she no
longer looks pregnant. Then she roams the forest until another man
comes to her aid. I don't remember much else about the movie, but I
would like to know the name of the movie? What is it????