This is something I've been chewing on with my current w-i-p, which is why I thank the stars the NA category was invented!
I had debated with making my protagonist a few years younger so as to fit within the YA genre, but I doubt it would work, as some aspects of my plot would probably not sit well with some of the YA mums if they're that lairy about swearing and scenes of a sexual nature. I'm planning to do a bit of sweary cull on a subsequent rewrite anyway (it would be unrealistic to take EVERY instance out, but I could probably ditch some of them without losing too much of the 'grit' of the story.) But the couple of sex-related scenes... I think glossing over those parts with 'fade out, then fade back in' (or whatever) instead would actually do more harm than good. They definitely DON'T come into the category of erotica, nor are they particularly graphic - but cutting them out completely just to appease some YA parents who don't like the idea of their innocent offspring accidentally reading about Sex Stuff is not an option from a story point of view. It has to happen, and it has to be very clear that this is what has happened.
It's always amazed me that things like The Hunger Games, with all its themes of teen-on-teen violence, are considered totally okay, while a lot of Judy Blume's books are still frowned on for their frank but balanced approach to teen sex. Kind of like MTV censoring decisions for P!nk's 'Just Like A Pill' video - they dubbed out the word 'morphine' from the song because that was a drug reference, but were quite happy with showing hordes of people licking, snogging and generally crawling all over each other in bondage gear! 
