I haven't finished the book yet, but I'm far enough to point out that the book hits several levels of "wrong-ness." For example...
(SPOILER)Vampires are typically considered undead. Does having sex with a vampire count as necrophilia?
Also, while Bella was pregnant, Edward said he'd rather she had puppies. Hmmm... "sharing" his wife, and with a dog?
Then Jacob falls inexplicably in love with a 5-minute-old baby...

One of my friends agreed with me on all of that, but everybody else is telling me that I'm thinking too hard and I should just enjoy the book. I actually asked about that first bit back when I was reading Twilight, because (SPOILER)on page 310, at the end of chapter 14, Edward more or less said said that they couldn't have sex because he'd crush her pelvis. I had to ask their opinion about it.