his Passivity Only Apparent--The Physical
Mechanism of the Sexual Process in Women More Complex--The Slower
Development of Orgasm in Women--The Sexual Impulse in Women More
Frequently Needs to be Actively Aroused--The Climax of Sexual Energy Falls
Later in Women's Lives than in Men's--Sexual Ardor in Women increased
After the Establishment of Sexual Relationships--Women Bear Sexual
Excesses Better than Men--The Sexual Sphere Larger and More Diffused in
Women--The Sexual Impulse in Women Shows a Greater Tendency to Periodicity
and a Wider Range of Variation.

III.

Summary of Conclusions.

APPENDIX A.

The Sexual Instinct in Savages.

APPENDIX B.

The Development of the Sexual Instinct.

INDEX OF AUTHORS.

INDEX OF SUBJECTS.

ANALYSIS OF THE SEXUAL IMPULSE.

Definition of Instinct--The Sexual Impulse a Factor of the Sexual
Instinct--Theory of the Sexual Impulse as an Impulse of Evacuation--The
Evidence in Support of this Theory Inadequate--The Sexual Impulse to Some
Extent Independent of the Sexual Glands--The Sexual Impulse in Castrated
Animals and Men--The Sexual Impulse in Castrated Women, after the
Menopause, and in the Congenital Absence of the Sexual Glands--The
Internal Secretions--Analogy between the Sexual Relationship and that of
the Suckling Mother and her Child--The Theory of the Sexual Impulse as a
Reproductive Impulse--This Theory Untenable--Moll's Definition--The
Impulse of Detumescence--The Impulse of Contrectation--Modification of
this Theory Proposed--Its Relation to Darwin's Sexual Selection--The
Essential Element in Darwin's Conception--Summary of the History of the
Doctrine of Sexual Selection--Its Psychological Aspect--Sexual Selection a
Part of Natural Selection--The Fundamental Importance of
Tumescence--Illustrated by the Phenomena of Courtship in Animals and in
Man--The Object of Courtship is to Produce Sexual Tumescence--The
Primitive Significance of Dancing in Animals and Man--Dancing is a Potent
Agent for Producing Tumescence--The Element of Truth in the Comparison of
the Sexual Impulse with an Evacuation, Especially of the Bladder--Both
Essentially Involve Nervous Explosions--Their Intimate and Sometimes
Vicarious Relationships--Analogy between Coitus and Epilepsy--Analogy of
the Sexual Impulse to Hunger--Final Object of the Impulses of Tumescence
and Detumescence.

The term "sexual instinct" may be said to cover the whole of the
neuropsychic phenomena of repro