The Most Offensive Part... *SPOILERS*
...for me was the castration/mutilation at the end and when she hurt that child. The sex didn't bother me at all, in fact they were some really emotional scenes. I'm just bothered mostly by messed up violence.
By the way, I rated this a 9/10. And I don't give positive ratings very easily.
F|U|C|K Twilight.
Best Movies of 2010:
http://www.imdb.com/mymovies/list?l=25714488