Your argument implies that a low desire wife is the husband's fault for not being sexy or seductive enough. That all women are really a cauldron of desire waiting for the right man to light the wick. If you can't make your wife want sex it is your own fault.

Do I understand what you're saying correctly?

As evidence you submit that "plenty" of women who don't have sex with their husbands go out and have sexual affairs, and are motivated to do so because they want more or better sex than their husbands can provide.

While most of this is lifted from "The Married Man Sex Life Primer" I'm sure you realize that you've pushed it beyond what the author was saying. The author conceded that some women are not looking for sex with anyone in which case the husband should leave.

Whether or not you agree with that is up to the individual.

Accuray

Married 18, Together 20, Now Divorced
M: 48, W: 50, D: 18, S: 16, D: 12
Bomb Dropped (EA, D): 7/13/11
Start Reconcile: 8/15/11
Bomb Dropped (EA, D): 5/1/2014 (Divorced)
In a New Relationship: 3/2015