Dawn is a teenage spokesperson for a group called The Promise. She attends groups with a few of her friends. One evening after giving her speech talking about the ring of purity those in the group wear and what it means, she is introduced to Toby and finds him attractive. The four begin going out as a group, and Dawn has fantasies of marrying Toby, although after acknowledging the attraction they agree that they cannot spend time together. Soon after they give in and meet at a local swimming hole. After swimming together, they go in to a cave to get warm and begin kissing.
He then forces himself on her; in the panic her vagina bites off his penis. Horrified, he stumbles away and she flees the scene. After a Promise meeting, she meets a classmate at a dance; they talk, and he drops her off at her home. Dawn researches female vagina mutations and realizes she vagina dentata, she visits a Gynecologist, Dr. Godfrey in an attempt to find out what is happening to her. After finding out that she is a virgin, he starts molesting her. She panics and her vagina bites off the fingers on his right hand. On her way back, she sees someone driving in Toby’s car, and she goes back to visit the swimming hole.
When she gets there she sees the police bringing up his body. At home, her ill mother has collapsed. Dawn’s stepbrother, Brad and his girlfriend Melanie ignore her and continue to have sex while she lies on the floor. Kim is taken to the hospital. She goes to a friend seeking help and the two successfully have sex. The following morning they have sex again, but mid-coitus his friend calls, and she learns that he had a wager on having sex with her. In her anger, her vagina bites off his penis, and she leaves him to call for help. Dawn learns her mother is dead, and Bill attempts to throw his son out, Brad sets his dog on Bill.
She meets her stepfather and stepbrothers girlfriend at the hospital, and emboldened by her power, she goes back home to seek revenge. Dawn puts on make-up and goes to her stepbrother, and they engage in sex. In the middle of the act, her stepbrother recalls when he was younger and his finger was bitten by Dawn as he realizes that it wasn’t her mouth that bit him, Dawn’s vagina bites off his penis. She allows it to fall on the ground, and his dog eats it, dropping out the head of his penis. Dawn leaves him to die from blood loss. Dawn rides her bike away from home, but it sustains a puncture, and she begins hitchhiking.
She gets a lift from a random, when she reaches the next gas station and tries to get out, he has the doors locked . He licks his lips wanting a sexual favor to release her; Dawn hesitates, and then looks towards the old man with a seductive smile. This movie was good but what you have to think about is what did it do for our society? This one movie did nothing for our society, but provide us entertainment. It was just something that touched a little bit on myth and what one person believes is reality. This was a greatly produced movie and it had a lot of different types of things we could have learned about.