I'm going by memory, but I believe his grandmother was a Master Physician for an Empress of China. Anyway this is the best book you will ever read about sex.
For example:
Nine Steps to Orgasm (works great!)
How to achieve 80% accuracy of determining the sex of your child during intercourse.
STD and health problems.
Mental and Spiritual bonding.
Million -Dollar Point (improves cllmax without depletion).
Many other tidbits you will learn.
I gave a copy of this book to my son when he was 21 years old. Young men learn about sex from p 0 r n o g r a p h y, not good, makes them lousy lovers.