They don't have to show nudity to make a hot love scene.
SM didn't grahically explain their nudity, so I thnk it could be filmed so it wasn't explicit.
The scene I'm concerned about in NM is the feeding-on-tourists scene at the Voluri's. SM didn't go into great detail but she let us know the gruesomenes going on, anyway,
Hardwicke was able to stick with the book, cut out enough soit could come in under 2 hours, and still made a great movie. We'll see if the NM director can be as effective.
I want to know what was Bella doing when Edward took apart the Head Board, PG-13 has pushed the envelope a lot with sex, I would rather have this movie rated R for us grown ups, who understand what's going on in the book.