"Sex is a natural human need like food and drink. It is true that men can survive without it, whereas they cannot survive without food and drink, but from a psychological standpoint the desire for sex is precisely analogous to the desire for food and drink. It is enormously enhanced by abstinence, and temporarily allayed by satisfaction. While it is urgent, it shuts out the rest of the world from the mental purview. All other interests fade for the moment, and actions may be performed which will subsequently appear insane to the man who has been guilty of them. Moreover, as in the case of food and drink, the desire is enormously stimulated by prohibition."
Bertrand Russell, The Place of Sex Among Human Values (via philphys)