I often recommend PM (passionate marriage) to people. I think it is a GREAT book that helped me address a lot of my intimacy issues. More than that, it really helps explain, on a more sexual level, the issues that exist between men and women much like Mars/Venus does in the rest of the relationship. It is NOT for the feint of heart, as was suggested but if you can stand a few "naughty" words here and there, it is a VERY eye opening way to look at things.