You can appear nude at any age with parental consent. Brooke Shields was 12 when she did nude scenes for 'Pretty Baby' and Keira Knightly was 15 when she went topless for 'The Hole'. Sophie is 17, so if she wanted to appear topless, D & D would certainly not be arrested for allowing it, but I'm glad they've chosen not to. I wouldn't be surprised if they used Ros for a fake Sansa plot at this stage. I feel like they've been leading up to it a fair bit, with her having red hair and blue eyes, being from Winterfell, and having a history with both Theon and Jon.