I got extremely lucky a couple of years ago when I got to be the regular DJ at a local swingers' group's monthly party. The view is great all night and since I happen to be unattached, the job has fantastic fringe benefits.
The naked party had a smaller crowd, which is normal for the last one of the year, but it was the die-hard core group who all know each other, so it was a wild night.
They stayed up in the party room with me a lot more instead of going downstairs to fool around, too, which I liked. My favorites were this couple who walked in early and got a table just off to my right side.
The woman was a short, chubby brunette with big breasts, a little soft tummy and a nice, rounded ass. She came in wearing a bra and panty set, and she and her partner, who was a really good looking, muscular guy (who turned out to be really cool when I talked to him) started dancing and making out immediately.
The next thing I knew, the bra was gone and as they were grinding on the dance floor, he was sliding and kissing his way down her body and sucking on her nipples and kissing her belly. They went and sat down with her in his lap straddling his leg and he had a hand down the back of her panties as they were kissing.
She turned around and started rubbing her ass against his cock and I could see that her panties were so wet that they were translucent (not that I had turned my colored floodlights on for a better look, or anything).
The next time I looked (I was paying attention to playing music sporadically) they were dancing again, both naked (he had been all along) and kissing really deeply, really barely dancing, just rocking back and forth.