Herman H. Rubin. Eugenics and Sex Harmony : The Sexes, Their Relations and Problems, Including Recent Fascinating Medical Discoveries, Prevention of Diseases, and Special Advice for Common Disorders. Herald Publishing Co.  (interior); Pioneer Publishing (jacket), 1941. 

(220 x 150 mm) pp. xiv, 574, 1 p. ads. Bound in black faux-leather with bright gilt title to cover and spine. Yellow DJ not price clipped, though suffers splitting and crumpling. Clinical and artistic black and white illustrations througout. Text block crisp and clean. Overall VERY GOOD condition. 

Offering on the one hand to "Banish your fear and sex ignorance forever!" on the front cover (promising), the reader is meant to "let Dr. H. H. Rubin's book reveal to you the True Mysteries and Dangers of SEX" (perhaps a bit sensationalist and/or alarmist). This handbook was intended as a working book for American families (evidenced by single pencil underline, "Explaining Sexual Life to Your Daughter" in Contents) and establish sanctioned mores around sex and adjacent topics, such as hormones, internal imbalances, and hygiene.