Studies in the Psychology of Sex

"We want to get into possession of the actual facts, and from the investigation of the facts we want to ascertain what is normal and what is abnormal, from the point of view of physiology and of psychology. We want to know what is naturally lawful under the various sexual chances that may befall man, not as the born child of sin, but as a naturally social animal. What is a venial sin against nature, what a mortal sin against nature? The answers are less easy to reach than the theologians' answers generally were, but we can at least put ourselves in the right attitude; we may succeed in asking that question which is sometimes even more than the half of knowledge.”