“The friendship of man and wife seems to be natural; for human beings are by nature more apt to join together in couples than to form civil societies, inasmuch as the family is prior in time to the state and more indispensable, and the propagation of the species a more fundamental characteristic of animal existence. The other animals associate for this purpose alone, but man and wife live together not merely for the begetting of children, but also to satisfy the needs of their life: for the functions of the man and the woman are clearly divided and distinct the one from the other.”
-Aristotle, The Nicomachean Ethics
