Expo

We had just moved to SE Asia then and lived not too far from a giant trade exhibition hall.
One lonely weekend, I took my reluctant husband to the little country's first sex exhibition. I saw large hordes of wrinkled single men and a few young couples there. There were no housewives or children who typically swarmed to the expo for the usual warehouse sales.
On a raised stage, a very enthusiastic DJ was trying to rouse the crowd, who stood unmoved. He wanted couples up there, and wouldn't say why. I looked at the impassive faces around and knew this country wasn't for me, so there was nothing to lose in making a spectacle of myself if I had to. So I went up the stage, pulling along my bored husband. Two young local couples joined us, encouraged by our presence.
The DJ produced oddly shaped velvet stools and couches from the wings. Our challenge was to use the props and demonstrate as many sexual positions in a minute as we could.
From up there, I had a better view of the sad old faces in the audience and nearly jumped off the stage at the thought of performing anything before them. My formerly bored husband suddenly found the humour in it and wouldn't let me go. He grabbed the mic and even made a little speech before he arranged the props and a very embarrassed wife into various positions on the props, counting off each one into the mic.
We won. Condoms, a video on the Kamasutra, lubricating gels ... And a vibrator ring.
I kept it by my bedside until we moved home. I gave my friends the other prizes, and it became their favourite party game with clothes on. That vibrator never measured up to my sportive husband's mastery on the stage that day, but it was the one prize I never gave away.