If Edward was dating your daughter, you would get a restraining order - and not b/c he is a vampire! Edward and Bella's relationship is a dangerous example for young girls. And my comment ignores the vampire component and any sensual moments that may have bothered others.
I think the danger is underlying the nature of the attraction between the two main characters.
From Bellas perspective: Edward is like a drug - she is addicted to the highs knowing full well the inherent dangers of her associations. Edward spies on her, he tells her he is dangerous to her, yet b/c of his beauty,his ability to save her from dangerous situations, and the chemistry between him, he has her hooked. He calls himself "the perfect predator" (p263 paperback) and he is. I will use this book as a talking point to teach my daughter about valuing herself and her safety so when she is offered irresistible drugs or men that will do her harm she will be a strong independent woman who can say no.