There doesn’t have to be any rape in the series! This is fantasy fiction, not history, and you can just choose to never have any rape in it.
Mary Sue’s wretched freak-out over this epitomizes this argument, saying bluntly, “rape is not a necessary plot device.” Well, no. Nothing is a necessary plot device. In fact, you don’t have to tell stories at all. Or only tell stories about some things and not others.
And that’s fine, if that’s your taste. There are lots and lots of fantasy stories that don’t have rape. I recommend Lord of the Rings and Harry Potter, which are both interesting and narratively complex and totally rape-free. Rape is not necessary to the stories they are telling, which are more traditional fantasy stories where the good guys always win, evil is always defeated, and the existing social systems are more or less just and correct.
That isn’t, however, the story that Game of Thrones is telling. Game of Thrones is telling a different story, one that explores the way that patriarchal systems that are often romanticized in fantasy would play out if they were more realistic. It’s one that is critical of the social systems in its world, holding them out as unjust and violent. And, like murder and war and poverty, rape is one of the consequences of that world.
I totally get not wanting to spend your time in a narrative that has a critical edge like that. A lot of the time, I am stressed out and just want to pour a glass of wine and watch The Flash, a show that has a black-and-white morality and takes an uncritical view of the social systems of its world. But I don’t want every show to be The Flash. There’s room for shows that ask harder questions.