Short review: I have been reading a lot on sex in marriage because my wife and I are leading a small group for newly married couples and we have been going through an 8 week discussion on sex. This book was the center of our discussion. It is not a perfect book but has a very good section on the different stages of sex which is better than most other books. When it is focused on either clinical aspects of sex or some aspects of couples working through sexual disfunction, it is a good book. It weakness was the overview of the role of sex in marriage at the beginning and the questions that men and women ask at the end.
Long review on my blog at http://bookwi.se/two-become-one-mccluskey/