Can you clear something up for me... just so I understand your definition of desire.... because what I hear you saying sounds like you are just horny all the time.... which I akin to lots of testosterone... a physical drive for sex. Yet... you pass on the thing you want, because you are not feeling desire from your wife.
Which says to me you've lost your desire to have sex with your wife, but not that you've lost your desire to have meaningful sex.
Is this correct? I'm not setting you up... I'm just making sure I understand your POV.