Teeth - the movie with the "criminal vagina" plot

WTF is wrong with movie producers this days ? Have they run out of ideeas that bad that they need to come up with such a movie ? At first, when i saw the trailer i thought it was a joke. Then I searched for it on IMDB an found out that the movie really exists and it actually has a pretty good rating (6 out of 10). This tells a lot about why there are so few good movies these days. Just read the movies description :

"TEETH tells the story of High school student Dawn (Jess Weixler) works hard at suppressing her budding sexuality by being the local chastity group's most active participant. Her task is made even more difficult by her bad boy stepbrother Brad's (John Hensley) increasingly provocative behavior at home. A stranger to her own body, innocent Dawn discovers she has a toothed vagina when she becomes the object of violence. As she struggles to comprehend her anatomical uniqueness, Dawn experiences both the pitfalls and the power of being a living example of the vagina dentata myth."
The trailer: