No, Sonia isn't correct. She, like many reviewers jumped on the band wagon and zeroed in on this one scene without actually thinking about the context (of incest to begin with) and remembering every other rape scene in GoT so far, up to and including the most recent episode where Burn Gorman's character states that he…

The entire episode revolves around the question of "what is a good King" or, in essence, what is power. According to Tywin, it is not holiness or piety, it is not justice, or strength, but rather it is wisdom. In describing wisdom, he brings up the issue of 'protection', which he tells Tommen is a matter for advisers.