Interesting - here's my contributions
1. At 18, I came home for Christmas from my first year of college. My GF came to meet my parents after Christmas and we rode back to college together. It was on that visit that I was first with a woman, downstairs in my bedroom. The best part, I had a swinging bed. Yes, suspended from the rafters by large chains to a metal box spring. It was the most comfortable bed I've ever slept on. (Maybe I should make one now that I think about it.)
2. At college, same GF. This one got us both kicked out (a strict Baptist college). After we got back to school, we were there about a week before everyone else returned. I decided to sneak into the girls dorm. We showered together, (that was a trip and very risky given the school we were in - yes, there were other girls in the dorm at the time). Then I stayed the night. We made love all night - If I remember right, we made love about 20 times. We would make love and drift off to sleep, then wake up and repeat. (Oh to be 18 again). She was sore for a couple of days she said.
3. Same GF (she eventually became my wife) - at a city park
4. Same GF - at a drive-in church (hey, it was So. Cal. back in the 70's). It was a cool concept. Set up like a drive-in theater, complete with speaker hanging from your window. Drive in, listen to the sermon, leave. But I digress.
5. Getting a BJ while driving down the road ... same GF, now wife ... with my sister (a teenager) asleep in the back seat. Traveling from CA back home to visit.
6. On the embankment, side of the road that was approaching a train track. Not GF/wife. It was broad daylight and an small airplane flew over. She waved with her legs spread, tits out and me banging her. It would be the last fuck of a 5 month long affair.
7. Same mistress, in my office on the floor. I think there's still some DNA on the carpet.
All of that was years ago ... I don't think I'm that bold these days.