Just wanted to add something to my previous post...
I disagree mainly because i've read the 4 books from the series that are out so far. Yes they are quite graphic, they involve sex, some incest and lots of murder but at the same time it's brilliantly written.
GrrM also does an AMAZING job at developing his characters, which as a reader, is something I have come to appreciate in a good fantasy book. He also keeps you on edge since he doesnt shy away from offing his characters.
These books may not be for everyone, which is apparent already from some of the replys. I just personally think that Martin is the type of Author everyone who likes fantasy should atleast give a try.