Nothing in that show, besides the fantasy elements, is even remotely far from truth of what has and does go on in the real world. Don't kid yourself by thinking this show is bringing anything especially evil and immoral to the table when it comes to humanity. Everything that goes on in in GOT is a theatrical reflection of what goes on in society and cultures past and present.
It's why I like watching it and also why its so popular.
As far as the sex goes....the sex is pretty tame and hardly porn. Actually there hasn't been enough tits and ass in season 5 for me.

Well, besides Cersei's public slut shaming.... she has got a really surprisingly nice rack, which had always been hidden under a cloak.