I didn't find the scene to be particularly controversial. This is Game of Thrones, and there are a lot of scenes that go from unsettling ("shadow baby") to downright disturbing (the cutting off of Theon's penis). To me, this kind of scene comes with the territory of Game of Thrones: nudity, gore, violence and upset can be expected. No one talked about how disturbing it was when Sansa very nearly was raped in season two, and she was a child. Nor is anyone talking about how some of the Wildlings are eating people. Technically the entire show is controversial; it's a brutal world filled with brutal things. Rape, even rape between main characters, falls under that.