Most people don't find that it really detracts from the shows, or that it's annoying or offensive. In the case of Game Of Thrones, it's in the story, in the case of Boardwalk Empire... Well, I don't even remember it being that bad. What's so awful about someone getting out of a bed and being nude? It's simply more realistic (I mean, they're cheating and such, so they've ****ed and then slept with these people, and then woken up... Clothes don't just magically appear) and at the end of the day, it's just a human body, maaaaaayn.
That and the worst culprits of this totally aren't HBO shows. *cough Showtime/Starz*