Yes, I've had experiance with this.
A Radical soloution, but it worked for us.
My wife & I sort of solved the sex drive problem it a few years ago.
You both have to get fit.
Try long, brisk walks around your neighborhood & make sure you both come back in a sweat.
It takes a lot of pain & work initially but it gets easier.
You; the gym. Your wife; somewhere there is another group of ladies exercising in some sort of way (mine does Pole Dancing now, she's 45 I'm 54)
Eat less or No bread, rice, pasta or any carbs at all. (maybe a biscuit with coffee here an there)
We did However do another Crazy, Radcal thing together and it involved a condom, about $400 & another lady but we both loved the experience.
My wife wants me every night now, Although, I feel I'm getting pressured all the time.
But I really can't complain, it's what every guy wants.