According to many Twilight readers, this novel has focused on a romance that is completely not common in our lives - the love between a human girl and a vampire. They fall in love with each other and decide to face all the difficulties even there are may lay in the road of their future relationship.
This is positive and energetic, but the story still causes the worries of some parents, especially for those of the teen girls. They mainly worry about some facts like "Edward, the vampire of the story, has possessive personality, human interests, and always gets angry easily or stalks Bella. He even sneaks into her house to watch her sleep before they start dating". So in many people's points of view, Twilight should be read under the guidance of adults, especially for teenagers who are under 18.
