Cas is going to talk about this like it's completely normal to discuss angel sex over burgers and fries. "We don't have physical forms in the same sense that mortals do. The need for physical closeness doesn't exist; instead we have a sort of metaphysical closeness that I suppose could be translated into coitus. It introduces the same feelings of euphoria and bliss between the parties involved, but without the carnal act of passing fluids between two bodies."