Game of Thrones writer 1: Okay, we've got our 50 minutes of boring filler, with 50 characters' respective story arc's moving slower than a snail. Now we need a scene to keep the viewers talking and interested, and disturbing enough to make them forget the previous 50 minutues of sheer nothingness, and the books have nothing of that sort. We're allowed to deviate. But how?
GoT writer 2: How about we show a beheading?
GoT writer 1: We did that a couple episodes ago.
GoT writer 2: How about a rape?!!?
GoT writer 1: Perfect!
GoT writers together in unison: We're so edgy!
In all seriousness, I thought the uproar the rape scene caused was pretty ridiculous considering the show rose to popularity because of it's graphic nature - and it's already proven nothing is over the line. I did see someone write a facetious facebook rant in which he was 'outraged' about Fat Sam getting raped by the wildling girl in the most recent episode which I got a nice chuckle out of.