Weirdest: his basement, me bent over a tool counter. His folks were outside and there's windows all around the top of the basement.
Kinkiest: In my old pool, at night. It's in a place where the pool can be seen from the very busy road, but of course they can't see INTO the pool, it's dark, and they're going too fast anyway. It was neat, because you're aware of all the cars full of people going by...but they don't know you're there and you're doing the naughty underwater.
Riskiest: Upstairs in a powerless abandoned brick mill on an old textile machine from the late 1800s. Risky because it was a public place that was unpowered and had no tresspassing signs everywhere. We were stupid to go in, but when the other couple we were with went off to go make whoopie, we did too. It was thrilling, but kind of gross. I got rust from the machine all over my ass and back - real sexy. Haha.