Brent Musberger

If your daughter was an actress doing a sex scene in a movie or television show, would you want to watch? On the CBS Late Show Thursday, Girls star Lena Dunham said that not only is NBC's Brian Williams often on the set for the filming of this sex-packed HBO program, the cast jokes about having a "BriWi-cam" on him to gauge his reactions to his daughter Allison's sex scenes (video follows…