Im Meyer's eyes (I believe), being a vampire, while having its otherworldly perks, is still not being human, and it comes with this terrible curse-- not being able to get close to someone without wanting to eat them. Edward DOES want to fuck, but he's the one smart enough to hold back, because he fully understands the danger-- he's been there before. Bella wants to fuck and doesn't care about the danger... she's still wanting it at the end.

So even though being a cool vampire is sexy, and I do believe the vampire wants to fuck... he's satisfied not fucking and knowing that regardless how desirable being on the other side may seem, he fully knows the curse that is attached to it.

But then again, Meyer writes on a 5th grade level. So maybe she didn't think it through to this degree.