What Esther repeatedly returns to is the notion that desire requires a certain perceptual aliveness. It is the capacity to experience another person as exceeding your existing knowledge of them. To resist reducing them to role, utility, predictability, or accumulated information. In this sense, Mating in Captivity becomes something so much larger than a book about sex or relationships. It becomes a deeply practical phenomenology of intimacy: a study in how to keep another person alive before you.