Ninapolitan, author of the defining guilty pleasure-The Bella Swan Diaries, and a few of her cohorts have started a blog for your ultimate guide of smut in this fandom. They are focusing on the realistic and truly sexy fics. So instead of trying to wave through the sea of disappointment, pop on over to The Perv Pack's Smut Shack for their recs of fics that will really keep you warm at night ;).
By the way. If you are under 18, THIS IS NOT FOR YOU. Who am I kidding? No underage would venture on over there right? I have full confidence in y'all's integrity.
The Perv Pack's Smut Shack