This is a very comprehensive book on the mechanisms of sexual addiction. It is direct and thorough, with lots of detail on the dynamics of this disorder and the does a good job of describing the disorder at the individual and systems levels.
I agree with the reviews below that this particular book might be a bit much for someone who is caught in the midst of early recovery sexual addiction and the attendant self deception that accompanies it. However, for someone well into recovery it offers much in terms of understanding this disorder at a deeper level.
This is a very good book for therapists considering different approaches to treating sexual addiction. Patrick Carnes is not shy about presenting his point of view and he is certainly an authority in this field.
I have also read Out of the Shadows by the same author and preferred this for my purposes in understanding sexual addiction. However, I think the two books speak to different audiences and both have value. Out of the Shadows is more appropriate for a sexual addict in recovery or for people trying to get a general understanding of sexual addiction.
My favorite book on this topic is Women, Sex and Addiction by Kasl. Her focus is on women, but there is a lot of good general information, case studies and explanations. However, it lacks the rigorous treatment of the disorder from a systems approach as well as the various treatment options. It does, however, include spiritual aspects of the problem and presents the topic in a very compassionate way. It also includes a lot of good information on sexual codependence