Asesino has some good points.
Human genes barely changed for the past thousands of years. However, human memes (this is Dawkins' term for the building blocks of knowledge and the rapid evolution of human knowledge through alphabets, numbers, print, video, internet and so on) have a more profound impact on human sexuality and courtship. How females react to the bad boy is also partly a socially learned behavior. Albert Bandura's social learning theory best explains this.
Basically, the Twilight series is a meme that promotes the sexual attractiveness of the bad boy some more.
- Sexual Attractiveness of the Bad Boy = Genes plus Memes
That's the missing part of your theory according to Asesino. It's a very good point.

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