Jack, of course, wouldn't feel the slightest bit self-conscious anyway, and in fact he's now moving to slide the large glass pane open so he can step out onto the deck. He glances round at Ianto, another big, happy smile spreading across his face. "A real vacation, yeah."
And then he's taking the couple of steps to the edge of the deck and jumping into the water, stark naked and completely uncaring. He emerges waist deep, and slicks the hair out of his eyes so he can call up to Ianto.