I don't know whether you've read the books, but it is very, very far from the lord of the rings. The porn was included in the books, in fact - much more so. It's a very cruel, yet realistic world Martin has described, sex and blood are a part of it.
I haven't read them. But, while the map and the storyline (so far) look like a slightly changed English and European history, it has dragons and monsters in it. In that way, it reminds me of LOTR. Of course, Sean Bean helps.
About the porn, I know it has to be realistic but come on, the guy was doggying his twin sister.
The viewer's guide is excellent. http://viewers-guide.hbo.com/game-of-thrones/#!/map/
They could make a great game out of this.