The Descent of Man and Selection in Relation to Sex / Volume II (1st Edition)

The Biology, Physiology and Sociology of Reproduction / Also Sexual Hygiene with Special Reference to the Male

Text Book of Biology, Part 1: Vertebrata

Logic / Deductive and Inductive

Five Stages of Greek Religion

Religion and Lust / or, The Psychical Correlation of Religious Emotion and Sexual Desire

Studies in Forensic Psychiatry

Confidence

The Sex Side of Life / An Explanation for Young People

Sex = Love, And its Place in a Free Society

The Future of The Internet and How to Stop It