Havelock Ellis 
The Psychology of Sex (Vol. 1-6) 
The Evolution of Modesty, the Phenomena of Sexual Periodicity and Auto-Erotism

Havelock Ellis’ groundbreaking work, ‘The Psychology of Sex’ spans six volumes and delves deeply into the psychological aspects of human sexuality. Ellis’ writing is characterized by its scientific approach, careful observation, and nuanced analysis of sexual behavior and identity. Published in the late 19th and early 20th centuries, the book challenged prevailing societal attitudes towards sex and paved the way for a more open discussion on the subject. Through a combination of case studies, research findings, and theoretical considerations, Ellis offers readers a comprehensive exploration of the complexities of human sexuality, making his work a seminal contribution to the field of psychology and sexology. His meticulous attention to detail and his empathetic approach to his subjects reflect his commitment to understanding and destigmatizing sexual experiences, making ‘The Psychology of Sex’ a timeless and relevant read for anyone interested in the intersection of psychology and human behavior.