Book XII, 211

If you were still uninitiated in the matter about which I go on trying to persuade you, you would be right in being afraid, thinking it is perhaps something formidable. But if your master’s bed has made you proficient in it, why do you grudge granting the favour to another, receiving the same? For he, after summoning you to the business, dismisses you, and being your lord and master, goes to sleep without even addressing a word to you. But here you will have other enjoyments, playing on equal terms, talking together, and all else by invitation and not by order.