The old pennies in the jar story is quite true..most cis hetero men lose much of their sexual interest in their bride after two years and the sex frequency drops dramatically.

Then there are people who are on the asexual spectrum. In my case, I'm demisexual, so I do at least feel sexual attraction after a prolonged courtship of over a year. And even then, it's just for one person, and I can take it or leave it.

But when I did indulge, my strong libido and capacity for play and variety intimidated cis hetero men, who seemed to prefer "rabbit love" - as quick as possible, which most cis hetero women seem to prefer..

I can only speak my own personal experience... I was married 19 years. Divorce was because my infidelity... Me and my wife then were a perfect sexual match... Sex was the last thing to leave and simply because when we decided to get divorce because is what she wanted... I found no point in sex with her anymore. My infidelity was not based on looking for something I couldn't get at home... My infidelity was the way I was... regardless who I had at home... I would had done it anyways because I am an Asshole to many women on earth. I never had a mistress and something I wrote while I was on an unaccompanied tour in another continent was what got me in trouble with her. That's how life turn out sometimes. I always been a Romantic. Always will be. I could have romance without intimacy but... what's the point? Marriage couples can set up all kinds of rules or conditions to continue what they have undisturbed... I am not going to judge them.

Maybe she doesn't find him inviting anymore. Not wanting sex with someone isn't necessarily indicative of a low sex drive.