I.

The Psychological Significance of Detumescence. The Testis and the Ovary. Sperm Cell and Germ Cell. Development of the Embryo. The External Sexual Organs. Their Wide Range of Variation. Their Nervous Supply. The Penis. Its Racial Variations. The Influence of Exercise. The Scrotum and Testicles. The Mons Veneris. The Vulva. The Labia Majora and their Varieties. The Public Hair and Its Characters. The Clitoris and Its Functions. The Anus as an Erogenous Zone. The Nymphæ and their Function. The Vagina. The Hymen. Virginity. The Biological Significance of the Hymen.