[Ol' Dan Tucker]

I know all about incestuous practices in royalty, going back to ancient Egypt and beyond. But by the middle ages in Europe, which the society in GoT approximates, direct brother and sister relationships were looked at with the same disdain as today. Why GRRM chose to almost normalize it is strange.

I don't see any characters in GoT celebrating the incestuous relationship between Cersei and Jaime. In fact, I see in other characters the very disdain you describe.

If I'm not mistaken, other than Craster's incest with his daughters, which is also shown disdain by other characters, there is no other incest-based relationships in the show.

How is this normalization?

[Telepathic Intruder]

"How is this normalization?"

I said "almost". How many sex scenes were there between Cersei and Jaime? Why do we need to see them? Jaime is portrayed as a good guy in the story (except for the first season), which sort of normalizes his behavior in terms of his popularity to the audience. Maybe you don't see it that way, but I do.