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.


LOVE AND PAIN.

I.

The Chief Key to the Relationship between Love and Pain to be Found in
Animal Courtship--Courtship a Source of Combativity and of Cruelty--Human
Play in the Light of Animal Courtship--The Frequency of Crimes Against the
Person in Adolescence--Marriage by Capture and its Psychological
Basis--Man's Pleasure in Exerting Force and Woman's Pleasure in
Experiencing it--Resemblance of Love to Pain even in Outward
Expression--The Love-bite--In What Sense Pain May be Pleasurable--The