Placing the sex toy — which resembles a woman’s private parts — on the coffee table, I gently demonstrate to our client how to perform oral sex.

“Think about what you’re doing with your tongue,” I tell him. “It’s a little like what I taught you about French kissing last week.”

My husband, Rob, who is teaching the session with me, weighs in. “See how she varies the pace?” he asks. “That’s the best way to bring her to orgasm.”

Wide-eyed and curious, our client, a 23-year-old virgin, takes his turn after I’ve thoroughly washed the prop. It takes a bit of trial and error, but he eventually picks up the technique. Rob and I smile at each other knowingly — it feels good to be helping this guy out.

To an outsider, sex coaching might seem a little strange. But to men like the virgin, a college student, we’re an invaluable resource. We might not be formally trained sex therapists, but — as a kinky couple who enjoy opening up our sex life to others — we’ve got a lot to offer.

It all started four years ago, after Rob and I began advertising ourselves online as a high-end escort couple specializing in threesomes with single men.

We wanted to spice up our sex life. It was all aboveboard and legal. Clients paid for our time, but if we were attracted to them and had sex with them, the sex happened on our own time and didn’t cost a dime. We were very strict about that.

One of our favorite things was putting on voyeurs’ shows, where the guy watched Rob and me fooling around.

Sometimes the guests joined in, but mostly they liked to watch. They were nearly always married, heterosexual men who wanted to indulge in a bisexual fantasy.

After a while, though, we became something of an agony aunt and uncle, because these men liked to share their problems with us. They’d talk about how they never had sex with their wives, or how they felt they’d be laughed at if they revealed their fantasies to anybody other than us.

One of our favorite things was putting on voyeurs’ shows, where the guy watched Rob and me fooling around. Sometimes the guests joined in, but mostly they liked to watch.

Soon, the escort side of things evolved into sex coaching. I showed one man who hadn’t had sex with his wife for 20 years how to bring romance back into their lives. Why spend money seeing us or an escort girl when you can hire a baby sitter and treat your wife to a date night? Rob and I taught him to use massage to get his spouse in the mood. I even went so far as to help him book a spa day for his wife before taking her to a luxury hotel for dinner and an overnight stay. And you know what? They finally made love.

I also helped another man who came to us to discuss his fantasies — including having sex with a mysterious Russian woman. He didn’t want to cheat on his wife, though, because he loved her very much. I told him to go out and buy his wife a wig and gently suggest that they role-play. The last time I heard from him, he was the mailman and she played the bored housewife!

All in all, we love what we do, and we’re hoping to expand our business with a YouTube channel and possibly a reality TV show. In the meantime, we’re grateful for the effect that sharing our sexuality has had on our marriage. We’re closer than ever because we get turned on by the fantasies our clients express. It makes for a far better sex life for us.

— As told to Jane Ridley