This was nonsense, he thought. The need of her was a physical thing, like the thirsty of a sailor becalmed for weeks on the sea. He'd felt the need before, often, often, in their years apart. But why now? She was safe; he knew where she was - was it only the exhaustion of the past weeks and days, or perhaps the weakness of creeping age that made his bones ache, as though she had in fact been torn from his body, as God had made Eve from Adam's rib?
Diana Gabaldon (2015). “The Outlander Series Bundle: Books 5, 6, 7, and 8: The Fiery Cross, A Breath of Snow and Ashes, An Echo in the Bone, Written in My Own Heart's Blood”, p.2151, Delacorte Press