Yes this movie/book promotes abstinence until marriage but that is all it does.
promoting abstinence is not enough to make this a good movie.
It is an attractive storyline to adolescent girls not because it has good morals (it only has one) but because every low self-esteemed, angst ridden, hormonal teenager (and older single women) is going to easily relate to Bella (the main character). Not because she's easy to relate to but because she is a shell where the viewers are able to place their lives into it simply because Bella is not a 3-Dimensional character.
This is bad story telling.
The message is NOT what I would ever let my Teenage daughter be exposed to (without thoroughly analyzing it).
Any parent worth their salt should take a closer look at the underlying message:
It is OK to become completely and blindly dependent on someone else without regard for logic or mental health.
It is OK to put yourself in harms way for someone else.
It is OK to abuse your partner
It is OK to neglect all other facets of life
It is OK to become obsessed with one person to love that person only because of what they look like and not because of who they are.
The above all happens in the book/movie between the main characters. And there are more reasons, these are just to name a few.
Edward is abusive, controlling and disrespectful to Bella - in spite of his traditional view with marriage.
Bella is (although book smart) passive, naive, obsessive, emotionally inept, impulsive, causes self harm, reckless, and cannot make smart decisions.
The relationship between Bella and Edward, although passionate, is not Love. It is Infatuated Obsession.
Why? Because NOT ONCE is Bella OR Edward attracted to each other by anything other than their looks/biology.
Why does Bella love Edward? Because he's beautiful and is alluring. An aspect that all vampires carry in this book that does not serve to make Edward more unique and leaving only his beauty. Meaning? Bella only likes Edward because he is pretty. In the books, Bella repeatedly mentions Edward's looks -eyes, skin, breath. However, she never mentions an attraction to any other of his more ideal traits.
Why does Edward love Bella? It's not because she's smart, it's not because she's endearing. It is because she SMELLS good.
It is admitted in both the book and movie that he is attracted to her because of the smell of her blood which he equates to his "own personal brand of heroine".
This is not love. This is not a message any adolescent child should be exposed to when they are growing up, finding themselves and trying to understand the world they live in. If anything this is a message of what kind of relationship one should not be in. Abusive, Controlling, Co-Dependent, Blind.