I find it rather comical the angry replies from women that assume, simply because a man professes to have lost interest in sex, it somehow implies that he can "no longer keep it up". That's what it always boils down to, hey? The ability to "keep it up". The ONLY THING a woman can say to emasculate a man and justify any actions she may take in the marriage. "He couldn't keep it up."
When my x wife and were first dating, I surely had no problem "keeping it up". Sometimes, I got scared that the SOB was gonna snap off it was so goddam hard.
But then, the cruelty, compounded by the misplaced anger, paranoia and blame for all of her shortcomings, sorta made him go limp. The x could lay there completely nood, but the emotion, the passion, all the necessary DRIVE and DESIRE had vanished. THAT'S why the majority of men "drift off" and even begin having affairs, in my estimation. Sure, there are a fair share of low-life deadbeat scum men that have to hound dog every woman on the planet.
I've pretty much 100% lost interest in sex. All of the trauma surrounding a sexual relationship with a female? [censored] it. Been there, done that. Pavlov's dog, etc.
Of course, if some pretty hose-beast wants to go fishing with me, that might still arouse a boner or two. (Maybe.)