I've commented on this before, and I'll say it again. This is one of the things I think the show's producers really did right. Not only does this mean that many character actions are more believable, especially later on, but it allows the show to get actors better able to act serious scenes. Plus, there's precisely no way that they could ever get away with doing the Daenerys scenes where she is naked/partially naked/having sex, even on HBO; some of which are important to her character arc (ASoIaF is a rare series that way).