On the hose bed of a fire truck and in the back of an ambulance while the crews were in the adjacent living quarters.

Mardi Gras
 

During Mardi Gras a few years back, a friend of mine owned a small gallery just a half block off Bourbon St.. He didn't open during that time because people were partying, not buying art, but he gave me the keys in case my wife and I needed a potty break or place to rest.

We were about done in by late afternoon, so we decided to go take a rest. We went to the gallery, it was not a big space, but it was cool, clean and we could go to the bathroom. When we got there, the owner's brother and SIL were already there, we chatted with them for a bit and they headed out. In the gallery it was very noisy from the crowds, people were going by right out side the door, for some reason, my wife was in a horny mood, likely because she flashed her boobs for beads. It was very unusual feeling, like were were having sex in a bubble in the crowd. Through the blinds we could see and hear people, but they couldn't see us, at least that's what I told my wife.

She still says it was one of the sexiest things we have ever done.

At Sea
 

I did it with this gal in the tuna tower of a sportfishing boat while fishing in the ocean. There were several others down in the cockpit (main deck for those not boat people) who were none the wiser. the wave action at that height made it even more fun.

In a teepee while 4 of my buddys slept all around us. It was the first time I'd met my friend's sister-in-law.

In the middle of a small, empty park. When we were finished and getting ready to leave, we saw an older guy standing at the fence at the edge of the park, watching us. Wish I had seen him earlier... would have given him a show!!!

Couple of others...
 

In addition to the above, I can add:

4.) On the swing set of the elementary school playground that I once attended up until the 5th grade.
5.) In a graveyard...on the grave of Mercy Brown, a local, legendary vampire. :eek:

I was in my senior year of high school working at night and weekends at a private club. Yes I was eighteen. There was this hot skinny tight ass girl whom tended bar. She was hot and she knew it. Many of the club members hit on her. All I knew, her name was Sheri and she was in college working as the bar tender.

One Saturday night around one in the morning after the club closed, the manager sent everyone else home and asked if I could stay another hour and help Sheri restock the clean glasses and clean up. It was extra money I could use. He left telling us to make sure to lock the door.

I had went into the kitchen to get a rack of clean glasses from the dishwasher. When I returned, Sheri was in the liquor room behind the bar. The manager must have left it unlocked. I walked around the bar and hear her inside this small room. I investigated.

I found Sheri sitting on some boxes of booze. Her slacks were around her knees. She had a bottle of booze between her legs rubbing it in and out of her wet pussy. She stared at me with this serious look on her face. Beings she was such a b*tch to us any other time, I turned to walk back out. Frankly, I was going to keep walking right out to my car. She groaned out my name and when I turned back around, she had that bottle inside of her pussy as far as she could get it.

She gave me a funny look and told me she hoped my cock was bigger than the bottle. The next thing I knew, her pants were laying on the liquor room floor, She was sitting on the bar with her legs up over my shoulders as I slammed in and out. I even had her small but firm tits out of her blouse mauling them the best I could. She was meeting each of my thrusts with her own.

Suddenly the door buzzer sounded. When it sounds, the bar tender pushes a button to let the member inside. We both scrambled to get our clothes back on and she grabbed her slacks and ran to the kitchen to get them back on. I pushed the button when she yelled for me to. In walks the manager. He had came back to lock up the liquor room.

He locked up the liquor room and after making sure we were doing our job, left again. We closed up and headed out to her car to finish what she started inside.

When we first got married, we lived in a really nice, brand new apartment complex on the north side of Indianapolis. When summer came, we used to hang out at the pool on the weekends and when our hormones got too excited we’d go into the clubhouse and have sex in the sauna with the smokey glass door. Not too easy to see in but you could if you looked for a bit. A few guys would stop and watch as Jen straddled me with her back to the door. And, there were a few stains on the wooden benches after we left.

Wife wanted to have sex in our car in the parking lot of a police station. It was at night and we didn't get caught.

MPLS Skyway System GYM
 

Back in college I had a job at a restaurant which was located in the MPLS Skyway system. One of the perks for the Skyway tenants was that the employees had exclusive access to GYMs built specifically for tenants at the Skyway level, these spaces had solid walls. And one of the perks of working at a restaurant is that you get laid a lot, if you play it right.
Long story short, a professor who used to lecture at a specific university in downtown MPLS used to frequent the restaurant a lot, and we had the hots for each other. Problem was that she was married and couldnt bring me to her place, and I was broke as F*** to afford my own place. So when I did make my move, I floated the idea that we could use the gym, since it was mostly unoccupied during the 9-5 hours and she agreed.
Oh the the thrill of having sex in a public place, where every wall has mirrors with the threat of getting caught, especially when you can hear the general public walking just a few feet outside those walls :o:D
I was 22 at that time and she was 37. I want to add that she was a marathon runner as well.