Youth and Sex

Erotica Romana

Studies in the Psychology of Sex, Volume 1 / The Evolution of Modesty; The Phenomena of Sexual Periodicity; Auto-Erotism

Studies in the Psychology of Sex, Volume 4 / Sexual Selection In Man

Studies in the Psychology of Sex, Volume 2 / Sexual Inversion

The Book of Dreams and Ghosts

Psychology and Achievement / Being the First of a Series of Twelve Volumes on the Applications of Psychology to the Problems of Personal and Business Efficiency

Studies in the Psychology of Sex, Volume 6 / Sex in Relation to Society

Sex--The Unknown Quantity / The Spiritual Function of Sex

Sex and Common-Sense

How to Get Strong and How to Stay So