ESO and the Art of Extended Sexual Orgasm
ESO - How you and your lover can give each other hours of Extended Sexual Orgasm (ESO) is a book written by two doctors in the early 1980's. It is by far the best book on sexual pleasuring I have ever read and it changed my sex life forever. The people at PurPlay asked me to try it using ESO the book as my guide. I jumped at the chance and the results were mind blowing.