Important information which all women should possess, but which few are given the opportunity of acquiring. The necessity of rational instruction on Sex Physiology, Sex Anatomy, and Sex Hygiene. The danger of false information from polluted sources. The conventional taboo against Sex Knowledge, which is inherited by the race from the Middle Ages. The Reign of Prurient Prudery. Ignorance of Sex Science is a frequent cause of immorality, and the real reason of marital inharmony and unhappiness. The special need of Sex Instruction on the part of women. The sex-life of the woman is fuller and more complex than that of the man, hence her special need of sane information on the subject. Nature's handicap on woman.