Every book has negative reviews. But the ones in here for this book must come from people who definitely did NOT READ THE BOOK!
If you are looking for a smut book, this is not it. If you are looking for some magical gimmick, there are none in life.
The Bodansky's put out their first book on ESO, (now EMO), back in the early 80s. I thank god for it! Otherwise I would have never known all these years what a couple could earn if they are willing to learn. It is so sad that so few have any idea what Great Sex really means.
This is not a book that is going to give you some quick gimmicks to quick orgasms; or some 'new position' that will light you on fire. (It's so funny to hear when some people equate the mystery of great sex to some mystery position).
One caveat: If your partner isn't likely to try something like this, you'll simply need to upgrade to a newer and more versatile model. For the most part, the benefits of this book require the full participation of both parties, (not one).
In summary: This book goes into the physiology & psychology of intimacy, (trust building exercises to how to control and enhance the partners level of arousal). This newer edition expands greatly on the first!
If only this book was distributed like books of faith, most of our world's problems and pains would be gone.