Next up on the ephemera list is another sex manual, The Manual of Hygiene for "Father and Son" from Hygienic Productions in 1947. It's edited by M. A. Horn, about whom I have learned nothing.
This 90-some-odd-page manual boasts an excellent Table of Contents, with chapters ranging from "Your Boy and His Sex Problems" and "How to Help Your Boy Curb Masturbation" to "Aid for Over-sexed Males" and "Aiding the Sexually Abnormal." I'll be sure to read both "Do You Understand Your Wife?" and "Woman's True Sexual Responsibility."
I'll share one small excerpt, from the chapter on women's reproductive organs:
While the chief function of the female breasts is to provide milk to a nursing child, they are definitely one of the lesser sex organs. The nipples contain erectile tissue, just as do the (... I'll skip ahead ... ) when they are kissed or otherwise handled. As a rule, cold, frigid women have small, undeveloped breasts, while those who are warm and well-sexed have well-developed ones.