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

This volume collects three studies that examine sexual psychology from historical, anthropological, physiological, and clinical perspectives. The first traces the origins and cultural variations of modesty, using ethnographic comparisons to show how social habit and secrecy shape sexual feeling. The second surveys cyclical sexual rhythms in humans and other animals, discussing physiological periodicity and its psychological effects. The third analyzes auto-erotic behavior through case reports and scientific literature, distinguishing common from pathological forms and surveying moral and medical responses. Throughout, the author favors candid empirical inquiry, challenges prudish secrecy, and seeks to separate natural variation from disorder.