[II.]
The Definition of Sadism—De Sade—Masochism to some Extent Normal—Sacher-Masoch—No Real Line of Demarcation between Sadism and Masochism—Algolagnia Includes Both Groups of Manifestations—The Love-bite as a Bridge from Normal Phenomena to Algolagnia—The Fascination of Blood—The Most Extreme Perversions are Linked on to Normal Phenomena.
[III.]
Flagellation as a Typical Illustration of Algolagnia—Causes of Connection between Sexual Emotion and Whipping—Physical Causes—Psychic Causes Probably More Important—The Varied Emotional Associations of Whipping—Its Wide Prevalence.
[IV.]
The Impulse to Strangle the Object of Sexual Desire—The Wish to be Strangled. Respiratory Disturbance the Essential Element in this Group of Phenomena—The Part Played by Respiratory Excitement in the Process of Courtship—Swinging and Suspension—The Attraction Exerted by the Idea of being Chained and Fettered.
[V.]
Pain, and not Cruelty, the Essential Element in Sadism and Masochism—Pain Felt as Pleasure—Does the Sadist Identify Himself with the Feelings of his Victim?—The Sadist Often a Masochist in Disguise—The Spectacle of Pain or Struggle as a Sexual Stimulant.
[VI.]
Why is Pain a Sexual Stimulant?—It is the Most Effective Method of Arousing Emotion—Anger and Fear the Most Powerful Emotions—Their Biological Significance in Courtship—Their General and Special Effects in Stimulating the Organism—Grief as a Sexual Stimulant—The Physiological Mechanism of Fatigue Renders Pain Pleasurable.