Me, my next door neighbor's apartment when I was still living at home with my parents (over 25 years ago).  What was strange was my Mom was in the kitchen cooking while I was railing my neighbor's wife and she heard it all through the wall, but since my first name is the same as the husband's, when the gal was screaming my name it was actually his name as well.  Later that evening Mom commented that "those pigs next door were at it again!"  I almost spit out my food.

We drove out on that evening to her home town, about 2 hours away from where we had celebrated over dinner with friends.

It was one of those "our house, our rules" type of deals, so they had set us up in separate bedrooms but long about 5 AM she snuck into my room for a quickie and then scooted back to her room.

She was my first girl friend and she was just 18, and I was 23.

I just loved the whole clandestine nature of the act.

Plus, we had just met and were wildly in love (i.e. hormone rage) with each other.

Come to think of it, I hooked up with her for a quickie at the place she was working (She was a residential caretaker in a group home for developmentally disabled adults.) once.  I guess our specialty was forbidden quickies.

The dock at the camp ground after midnight...  I worked there...  she was married.  We were very naughty.   We were never "caught" but it became "known"...  of course, then the RV went somewhere else.  
We continued to see each other ON & OFF for several years after that.  She was on night shift & I'd call & she'd let me in a back door & we'd do it in an empty office.

I don't know about "strange" but in the movie theater (Skyfall) with a client and on a church bus when I was younger.  
I've given head in restaurants, grocery store, airplane, etc.  But intercourse in public is harder to concea

Keep in mind that these places are full of video cameras monitored by guys who love to post stuff on the internet.

Just sayin'......

coming and going...incredibly hot watching folks pass by while doing the deed!

Out in the water with a GF about 3-400 feet down the beach outside the bathing area that the lifeguards watched.  We were hugging when she decided to pull her bikini bottom to one side and pull me out of the top of my trunks.  We did'nt move much, just stood and bounced on the motion of the swells until completion.  From the shore it looked like we were just hugging and talking.  Water was N Atlantic grey/blue and not very clear so I don't think anyone was the wiser.  Lots of years ago.

I was enjoying a double with her and your wife. Don't fret, she mentioned your name, when she screamed oh daddy.

And she was serious as a heart attack, that was a "priceless" moment

The first was my High School girlfriend, her parents used to let us watch TV together in their finished basement. It was wintertime and we had a blanket over us from the waist down, I was behind her in the spoon (or as they call it today lazy dog) position. Her Mom came downstairs and talked with us for about 5 minutes, the entire time my cock was in her daughters pussy. That was back when I could keep an erection during such an encounter. The benefit of being a nerd, I'm quite sure that her Mom would have never even suspected such a thing.

I don't have a daughter (that I know of) and if you can get my wife to put out more than 2x a month you are a better man than I.  Good luck bro.

...a friend of hers was driving. She was on top and I could see his refection in the year view mirror gawking. Eyes popping, head bobbing to get a better view.

While on safari in Queen Elizabeth National Park and our tents were in a remote area away from any tourists or park personnel. Our tent was next to our 2 kids tent. With hippos making their typical noise, an occasional lion's roar and hyenas laughing as if they knew what we were doing but they were more intent on snooping around for scraps (they didn't find any).  With this background we had sex on the floor of the tent because our camp cots were too small and unsturdy for the activities.  
During the 2 years we were in East Africa we had sex in numerous wild settings. I remember this one the best.  

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Many times in public and some are better stories than this but the strangest was probably fingering a girl to orgasm under the table at a bar while she jerked me off...I came on her leg and thigh high, then she rubbed it into her leg and hose and used her come covered finger to stir her drink. Check please, back to her place for an epic monkey sex throw down...those were the days.

Got a HJ from a top 5 now retired gal under a busy restaurant table. Came in her hand and she slowly pulled her hand up lapping up the spunk like a kitten would its milk. Too damn hot.  

Well, I've never knowingly screwed another guy's wife especially somebody whom I know.  But as long as they are separated and going for a divorce, fair game.  Now if I didn't know him, and she was willing, then maybe I wouldn't feel the same way or care as much.

You should have married the woman next door, at least you knew she put out.

Or even unusual.

for the weekend. On the drive there, he said his sister, a high school senior, was off limits (she had her own ideas!)  I was 20. I met his sister, a tall blonde, at dinner. later that night  she crept into the room I was sleeping in and took me back to her room and screwed my brains out! I made that trip many times before my transfer with him being non the wiser. Great memories!

The medical clinic parking lot wasn't a planed parenthood facility, was it?

Yup!

Sorry to disapoint you, but it was just your normal medical building with a couple family practice Doctors' offices, and a couple of dentists. For us, just a convenient place to pull over and park.

Disappointed? Barely, thought that would make for a good bad joke.

1st, the theater was only about 50% full and he and I were the only one in the back row.  There was another couple two seats over in the row in front of us.  
2nd, I was wearing a flowing short dress without panties.
3rd, condom was readily available in my purse.
4th, we had to be very quiet as I climbed onto his lap, both facing the movie scree

I should have been studying but I seen this girl from my class who I thought was just super hot and never got to talk to her. I walk up to her said "hey I reallly like you shirt" she said "thank you its old i don't see why you like it".... I'm a honest person so I just said well your boobs are sitting really nice in there screaming touch me please.. I said that with a grin without missing a beat... She must have felt the same way I was feeling she said well touch them then. OMG I did one thing led to another and FIV then I went under the table to DATY it was all so yummy until the librarian came and told us we had to leave. BONUS for going to a big university. So we just finish at the dorm.. It all started with the books

One provider that I was seeing had me pick her up at Penn Station in NYC. She gave me a BJ on the way to the hotel while I drove through mid-day traffic. Zipped it up in time to park and continued in the room.

I lived near a marine base growing up. While all the girls at school were googly eyed over the football players, I had my eyes on the hot studs from the USMC. Most were young, fresh out of boot camp, but some had nice bodies and drove cool cars. I was 16, hot, and wanted them all!! LOl.  

nude bar.  Yes, the stripper came out to the parking lot and we did the deed on the carpeted floor of the van.  Back then (80's) there were certain bars or clubs you could go to and know there was a good chance of getting laid later that night.

a starlit beach in South America with a gorgeous Argentinian, and the water sparkled with phosphorescence! Strangest is a toss-up: hotel lobby area, church doorway, stairwell of an apartment building (with no elevator), or a jet ski (parked, not moving). Lol!! I've had rockin' sex in many more interesting places as well... ask me about it sometime.

She was a very seductive younger blonde that was not so subtly after me when were in school, but I never gave into her as she was a Freshman and I was a Senior and always dating girls my age.

Thats right folks....Disneyland.   It was late...no body was on the ride (Small World).  It was a quickie  :