This is powerful stuff! The author teaches hypnosis techniques that can be used to profoundly and permanently change a person"s personality and most deeply held beliefs. Like any powerful tool, you can use this for great good or great evil, so this is only for couples who totally trust each other. The author focuses on S&M, and many of his examples and hypnosis scripts deal with getting your partner into S&M and / or providing sex on command, which isn't what we, or most couples, are into. However, if you look past that you'll realize that techniques powerful enough to achieve such a dramatic change in a person can easily be adapted to achieve your idea of better sex, loose weight, improve self image and confidence, and even to eliminate self-destructive behavior.
Buy ithe book, use it very carefully, you'll be very glad you did.