I just wanted to reiterate that "The Married Mans Sex Life Primer" by Athol Kay is an excellent resource to increasing sexual attraction and desire in existing relationships.
I've heard some trash his "sex rank" system in the book, but in reading it myself, I feel he provides a scientific and methodical approach in increasing sexiness within a person.
He also gets you to understand some of the subconscious reasons why a wife may not want to have sex with her husband and how to trigger her desire without her even being aware of it.
He also alludes that if you do all that you should, plus the extra approaches at some time you need to move on and find someone who wants to be with someone like you.
