an image of the couple having sex tried to push its way into tracys head , but she had no place for it to godid not know what having sex , the all-the-way kind , looked like in detail , and so the image became , in the end , a scene in which miz grace lay beside her husband , bare shoulders exposed as they lay beneath the covers , hand lightly resting on his chest the way tracy saw actors do on tv , his arm wrapped gently around her shoulders .