Thank you for sharing this, Misslee22, and for all the responses. I've read them all, and here are my two cents, as a happily married man for decades with a woman who does not share this fetish, but has indulged me over the years for sure. But less so as we've aged.
You seem like you have a wonderful, strong and happy marriage, which you should, and clearly do, cherish.
What you're describing, married people having "relations together" less often as they age, is as common as leaves on a tree, in any marriage. Libidos decrease as we age. "Sex" in whatever form we desire, becomes less common, even in the healthiest, happiest marriages. People get used to each other. And other things in our lives, hopefully, give us different kinds of joy and happiness. Many way more than this fetish.
Our fetish, like most all others, does not lead to what sex was designed for, biologically or otherwise, which is pro-creation, so anytime we engage in it with our spouses, it's purely for pleasure. There's nothing wrong with this at all, obviously, but I hope we all accept that it's purely a pleasure-only thing. Sometimes we engage in it together, sometimes solo. To put it another way, sometimes we eat steak and lobster together (or insert your favorite food here), sometimes we do it solo. We used to eat it a couple of times a week. Then once a week. Then once a month. Then once every couple of months...you get the picture. It's much better to eat steak and lobster together with my wife, and share the joy in how it tastes simultaneously. But sometimes she's sick of steak and lobster. It's not her favorite food of all the rest, and even if she likes it a little, like anything, she gets bored with it. So I need to eat it by myself. It's not ideal of course, and maybe even a little sad to eat a steak and lobster dinner by yourself. But, it, um, still tastes good.
In the end, this fetish exists purely do give our bodies extreme pleasure for a couple of minutes, nothing more. If we're able to engage in it simultaneously with someone we love, that makes it even better for sure. But it will always be a pleasure of the flesh. At the risk of sounding like an old fuddy duddy, as you reach your 40s, 50s, and 60s (and beyond!) you'll come to realize there's honestly more to life than pleasures of the flesh. And part of what's made my life an extremely happy and fulfilling one is discovering those other joyous things, with my wife, over a lifetime together.
Good luck and Godspeed!
