I think this is very easy to understand, especially if you have been or are in that position.Yes, a lot of we older married men haven’t lost our sex drive the way our wives have. Knowing how "easy" we men, in general, are sexually, we become very opportunistic. I like the idea of 'no strings attached' sex, and that's pretty much what you get with married men. We don't want to 'ruin' our marriages (for numerous reasons) but we need to be sexual. And so, a cock to play with, besides our own, is always a tempting proposition.
In my case, I had a personal cocksucker (my father's age) when I was younger and have received many blowjobs in ABS video booths ever since - all without a romantic connection or kissing. If I wasn't afraid of "catching something", I would have returned the favor long ago.
I experimented some when I was younger... now I am passing that "middle age" bracket I have been thinking more and more about meeting a discreet older man.
In my fantasies sometimes I top him... sometimes he tops me and I cum hard thinking about holding his cock and feeling it grow in my hand...