http://entertainment.time.com/2014/01/10/girls-and-nudity-why-naked-women-dont-have-to-be-titillating/

Hannah's nakedness serves another purpose, most notably illustrating the intimacy between the show's characters.
Read more at http://www.hitfix.com/tv-tattle#HomedlLEhHZhF8Qb.99

As long it's done in a realistic and honest way.