Yes six is portrayed in movies and novels to excite and catch the viewers eye. But in Game of Thrones it's also used to show that six is part of the human experience, just like violence. The general population wouldn't mind seeing a head being decapitated from a persons body, but if a man or woman showed their genitals, people would react in a more shocking manner. Violence is censored yes, but six is censored more.
In the books that's true, in the TV series they use it primarily as a way to distract people from the fact that they're giving "boring" background information. Those are usually scenes that aren't in the books. The worst offender was that episode with Littlefinger talking about his mindset and foreshadowing himself as the bad guy while two prosttutes screamed and did body cavity searches in the background. Just... unnecessary.
I don't think six is censored more than violence. six is in almost every TV show or movie. Just not always graphic, and that's the same with violence. You might see pew pew and someone falls down with a little fake blood, but that's the equivalent of the "fade to black" six scene which is pretty ubiquitous.
Anyway, I guess it's only tangientially related to the topic. So... hurry up April 1st!!!