In 1917, Dr. R.B. Armitage published Private Sex Advice to Women. His intended readership: young wives and young women who plan to marry. The purpose of his book was "to give enlightenment to those entering into wedlock so their married life will be one of happiness and pleasure."
So, let's test your knowledge of doctor-approved sexual health info (and, I guess, the likelihood that you would've experienced happiness and pleasure in your marriage) in the early 20th century!