Sex Quotes in Eclipse

[Edward to Bella:] "And I should feel sorry that you're not sorry, but I don't." (2.85)

It seems that part of the lure of sexual attraction is that it harbors something forbidden.

Even more embarrassingly… I wanted his venom to poison my system. (14.151)

The idea of Edward biting her has a sexual attraction for Bella. Are sex and violence related? Why or why not?

I knew which human experience I was going to insist on before I became inhuman. (20.12)

Out of all the human experiences Bella doesn't want to miss, she picks having sex with Edward. What's so fundamentally human about having sex?