It's interesting what you say about that book as that's absolutely the approach I took.
When it dried up for me (and it was borderline spectacular beforehand), I obviously blamed her immediately. What I never did was look to address why she wasn't in the mood, and see if the issue lay partly with me.
I think it's a fair assumption that a lot of blokes are lying around on the sofa, overweight and out of shape, contributing little in the way of excitement or happiness to the relationship, so we can't really be surprised if the wives don't get turned on in the same way we do.
In my experience, the other half looks at sex as the culmination of a lot of other criteria that need to be satisfied before she mentally allows herself to open up (in all senses of the word).
My solution was to change a lot of things. I'm in pretty reasonable shape anyway, but I looked back to the way I used to treat her.... flowers on the way home from work on a Friday, more spontaneity in what we did over the weekend, pushing her to get out midweek with the girls, both of us hitting the gym harder, doing more stuff with our daughter, more fun etc etc...
Worked temporarily, but was nothing like it had been in frequency or style, and I'm a reasonably experimental type with a higher drive than her. Unfortunately, like a lot of women, the concept of talking about sex or being open filled her with dread and she got all embarassed, so we never dealt with the issues.
Like many, I started with massages before moving onwards and upwards, but I will quite happily admit that I don't find the closeness or the satisfaction from wgs that I did with her. This is quite possibly down to some elements of guilt, or that one night stand type interactions will never compare to two people who are intimate with each other in every way, but after a year without, you take what you can get/afford!
All a bit fluffy and therapy-like this is, but just some honesty. Incidentally, we split recently for several reasons (sex being one of them), but maybe just proof that women who aren't happy in themselves are never going to make you happy in that department over the long term.
Right enough waffling from me....off for a browse of AW!