This is a very good and helpful book to couples having difficulties in their marriage. It is not really about marital sex lives but more about communication of needs and feelings which most commonly display themselves via sexual issues. The only problem with the book is that , for it to be truly helpful, both people in the relationship need to agree there is a problem and be willing to accept that part of the problem is their responsibility. This book is no real help if only one partner is open to change.
This book may be helpful to a lay person but not a professional. This book was probably written by a woman without a masters degree in counseling. Did you know it is legal for anyone to hang up their shingle as a "therapist" no credentials needed. She has a few fine points in here, but I'm sure you will find that in much better books. Look for something better.