There is no porn in Game of Thrones, nudity and sex on the other hand is there in abundance.
The human body is not obscene, time to grow up and get over it.
Porn? No there isn't any porn whatsoever in GOT. Nudity and the occasional (simulated) sex scene? Yep, plenty of them. I don't think it detracts from the overall plot of the series though and they aren't just thrown in as filler, like they are with shows like Spartacus. It's like the writers on that show think to themselves "we haven't seen a breast or a penis in 15 minutes, we're going to lose the audience's interest if we don't put a whole room full of tits and cocks in immediately."