When you have to literary start begging your spouse/significant other for sex?And how do you deal with it?

it's like man's best friend begging for crumbs

And have been having a great time ever since.

I have no interest in having sex with someone who has no interest in having se with me.  A short same old routine done and run that feel like  pity fuck. I have aways relied on friends with benefits and provider (who admittedly would not be having sex with me were it not for money, but it doesn't feel like that.) I love my wife and am glad I have a good outlet. which allows me to stay married without staying angry all them.

and this has happened once and not too log ago is that you and your friend with benefits fall in love and the marriage risks to end with ll they sometime terrible effects on the large number of kids, grandkids, the wife who yu still love na who has become your best friend etc.  I have been through that one 30 years ago and the fall out to people you love is really not what you would wish.
I broke it off with that beautiful lady with whom I was madly in love and I still, two or three years later miss her. terribly.

There's someone else or he's hitting the porn hard. Neither is a crime (IMO), unless it starts affecting your sex life. Porn is the scarier 'other woman', in a lot of ways. If faced with repeated sexual rejection or a need for increasing deviance in order to 'keep up' with the sea of images in his brain, I'd walk.

I thought I had it made when my wife allowed me to hobby for a number of years while we remained sexless, however she eventually decided to cash in her chips and divorce me, sending me into a financial tailspin that has to this day impinged on my ability to hobby.l

"Lady Chatterley's Lover," perhaps.

If you open the OP, look for the "Edit Message" button below your post.

Without overanalyzing this, my wife and I decided early on not to have children. There was always a lot of love and respect and that continues to this day. Sometime in our thirties however, the sex just slowed to a trickle. No fingerpointing at all but it seemed that work, friends, events, and other activities took on a higher importance in my partner's mind. I'm happy to have found and enjoyed the time and company of some wonderful providers since that stretch. In some ways, finding the hobby may have played a small part in saving my marriage.

This weekend, I had a 95 yo woman tell me to read the Bible for racy scenes. I hope she wasn't hinting that she'd like some action! (The Song of Solomon is pretty good, but I like the song of hobbying better.)