Always game to push the boundaries of the portrayal of awkward sex on television, merely a few short minutes into Girls’ fourth season, Lena Dunham managed to up the squirm factor by tossing in some unexpected butt play between Marnie (Allison Williams) and Desi (Ebon Moss-Bachrach). We caught up with the cast (and Brian Williams) at the season four premiere and asked them — as delicately as we could — their thoughts on the soon-to-be-infamous sex scene.