I think every series I have watched on any of the premiums has at least some nudity and adult language. I think they did it at the beginning just because they can and as a way to do something the other channels can't do. Don't get me wrong, I like seeing naked women but I really don't think it adds anything to a lot of these shows. For example, the nudity in this first episode of Black Sails had nothing to do with anything else that happened in the episode.
Situations like that always just seem like a not so discrete network mandate whenever I see it. Every time I see it on any of these premium shows I just think, ok they hit their Starz required boob quota for this episode. I think some shows handle it better (in less ridiculous ways) than others but they all seem to be forced to include nudity.