That'd be interesting... the T.V. shows become cannon if no one finishes his book series like Brandon Sanderson is finishing Wheel of Time.
In any case I read there was a delay because he had some idea of moving the storyline 5 years forward but ended up scrapping the idea and rewriting much of the last book.
Hopefully if the above is true there won't be too much delay as a major block to moving the story forward is possibly gone.
IMO, It would be a much bigger loss to fans of fantasy novels if George R.R. Martin passes before he finishes ASoIaF than it was when Robert Jordan passed.
Too be honest there is a decent amount of sex in the books but probably no more than many other books intended for adults.
I'm sure HBO wanted them to up the sex count in the T.V. series to placate people who are incapable of reading the books