Little cave at Red Rocks in Colorado, gf, late in afternoon, fingered her to organize, got bj

Went for a jog with another gf on Galveston Island, cooled iff in water, I had my arm through both her swimsuit bottoms and my running shorts

With gf, at bottom of trail that goes down to river, doggy style with her hands on Boulder

Finger fucked a lot of ladies driving down the road

Met lady traveling on business, things developed rapidly, fucked her up against wall of elevator while going up to her room to fuck.

Met lady at club, danced with her a lot, with club still busy fucked her from behind while "dancing", never got her name

Girl with enormous sex drive and reputation, in college, brought her virginal friend up to my room, to give her friend "instructions". Did oral on each other, then fucked, virginal friend started rubbing herself, later took virginity of that girl while the first one watched

At university, tower stacks held graduate library, had numerous girls while looking out over campus

Train sex
 

This might be kind of a weird place but one of the best places I had sex is in long distance trains. I dated a married Indian woman for few years. She was 26 when we started dating and she was living away from her partner. Couple of times a month when she goes to visit her husband, we book tickets together in a private coupé in the night train. It was a good feeling to fuck in a confined space. After the ticket checker verified our tickets, we would lock the coupé and she always loved to start with a blowjob mostly ending up with her swallowing. We had lot of time with nothing much to do, so we would end up having sex 4-5 times in the whole journey.

Lecture theatre or a mountain top
 

Probably for me either a university lecture theatre - I was a postdoctoral researcher so had a key for the building and this was an old lecture room with banked seats going up a couple of levels. I was dating an undergraduate student and we got it on in the lecture theatre, got her completely naked on the lecturers’ bench at the front, ate her out for a bit until she was really moaning and then we fucked!

Or secondly would be a few years later hiking with a friend, too if a mountain, very quiet and the girl said “wouldn’t it be cool to have sex on a mountain top in the fresh air”. We hadn’t done it before then but we’d flirted a bit…so it was certainly an invitation to enjoy the location!!

Hanging on to a small boat
 

A few years ago my wife and I spent our hliday on an island in the mediteranean sea. We decided to rent a small boat for one day and enjoy the freedom of driving around the coast.

Once we left the harbour we both undressed and stayed nude for the rest of the day. There were a lot of other boats near the coast on that day. I would estimate that 50% of the woman on the other boats were topless, a few were nude. But my young wife still got a lot of attention when someone was passing us.

We set anchor between two beaches next to the cliffs to have some privacy. There were boats passing a 100-200 meters away. My wife was sitting on the small bench and I went down on her, she was already super horny and came quickly. Then we switched positions, I sat down with her between my knees and she sucked my dick. Before she could finish her job another small boat arrived and she stopped, I believe they didn't notice what we were doing.

On the boat were two young couples, both girls were topless. They sat anchor 10 meters next to us and opened some drinks.
We were still super horny and wanted to fuck, but were to lazy to raise the anchor again and look for another spot. So my wife suggested to jump in the water and fuck there.
We jumped in and swam to the side of the boat facing away from the others so they wouldn't see us. I held onto the latter on the side of the boat with my wife between me and the boat and started fucking her.
At first we were worried that we would shake the boat too much but with the waves we guessed that it wouldn't be visible. The sex was wonderful, I fucked my wife harder and we were completely focused on ourselfes. That way we didn't notice that the wind had changed and turned our boat slightly.
Suddenly the other boat came into view. My wife had her eyes closed and by the way she moaned I could tell she was close to orgasm. I just wanted her to come really hard so I fucked her extra hard which made a lot of splashing sounds. She finally came with a loud moan - I also came and shot my load into her pussy.
After catching our breath we realised the boat had turned so far that the two couples had the perfect view on us and they did indeed watch us fuck. When we looked up to them they cheered :D My wife was mortified :p
But she later said that I did the right thing to continue fucking her :)

Fucking in the sea can be difficult. Sea water is not a good lubricant. My wife and I were on an evening cruise with a bunch of friends. We were all swimming in front of the boat and we started fucking. Our friends could not believe that we had managed it, and dove down to verify that my dick was in her.

DR

Cliffside to Roadhead
 

My wife and I were hiking a steep canyon trail along a nearly dry creek in the Mojave Desert. The footing was loose scree and decidedly treacherous; we had to be very careful. She clung to my hand as much as possible. We reached a wide spot of the trail and looked down into the canyon. We weren't up all that high- no more than 75-80 feet above the creek but it was nearly straight down. We took a breather and then eventually the fresh air got to us and we started making out a bit.

I undid her jeans and reached into her panties - she was already quite wet. I continued kissing her while I stroked her pussy and pressed on her sensitive nub. She pulled her tit out of her top and presented her nipple for my licking and sucking. In a few minutes she shuddered and moaned and came on my fingers.

My cock was quite hard and she did the same as I had - reached into my shorts and found my cock. She was squatting on the edge of the path while holding on tightly to my legs. She played a little bit but then looked up at me with fear showing on her face. She kept playing but also kept looking about and checking her footing.

So, I stopped her and said we should retrace our steps and hit the road to get home. She looked fairly relieved and we carefully went back the way we had come in.

Once back at my truck she kissed me with some passion and said, "Thanks for that - I was really scared". I said that it was no problem and we got going. Once on the road (out in the middle of the desert with little to no traffic) we had only gone a little ways before she reached over and undid my pants while I continued to drive. Once she had "Little Sly" freed she leaned over and took my cock into her mouth and began a soft, leisurely sucking. This continued for several miles and I loved every moment. She finally came up for air and saw that we were getting much closer to town and our home.

I feared that this would be the end of our fun. I was wrong - now knowing that time was running out she literally attacked my cock and kept it up until I felt my cum rising and ready to blow. I tugged at her hair and said "I'm going to cum if you don't stop". She turned her head just enough to smile up at me, and to run her tongue all around my glans. She dove back into pumping me with her mouth and in moments I was growling and cumming.

Due to a bad experience in the past (she was gang-r***d by classmates while in high school, long before I knew her), she did not like my cumming into her mouth (swallowing, of course, was off the table). In practice, she would pull away just enough that I wasn't shooting directly into her mouth, but would still keep her tongue moving around on me as I started spurting, with it usually landing in my pubes, unless she directed my shots across her tits or belly.

Whew! Once I finished (by this time I was not in full control and had let off the throttle enough that we were almost at a standstill in the middle of the road), she sat up and wiped her mouth while I continued to slump in the seat with my pants wide open and my shrinking cock in the breeze. I stayed that way all the way home until we were in our driveway. It took me that long to catch my breath and for my heart to settle down. I daubed at my pubes with a tissue, but she said, "Oh, you shouldn't find much - I swallowed most of it." WOW! I loved her even more right then!

We never repeated that experience - I think it was enough for both of to be able to check that off the bucket list.

On a down note, about six months later a co-worker went hiking on that same trail. A quick misstep and he fell to the bottom of the canyon and was killed. :(

College Library
 

My girlfriend (now wife) had gone to the college library late one night. They had one copy machine down near the stairwell in the basement. Hardly anyone used that machine -- especially late at night just before the library closed at 10 p.m. We went down to that machine to copy some info for research papers we needed to write. It was about 9:45 p.m., and no one else was down in that basement. We started talking about how it might be fun to get upon the copy glass with nothing on our bottoms and let my girlfriend sit on my lap while we plugged in a few dimes. We pulled off our pants and underwear, and I sat down on the copier glass. She climbed up on me while facing me. Initially, we just got a picture of our privates mashed against the copier glass. But the enticement was just too great. I rammed my dick into her pussy while she straddled me. I dropped in a few more coins and that bright green light scanned our delight. Eventually, I started pounding her back and forth. Just then, the door opened from the floor above, and a woman's voice said, "Library closing in 5 minutes. Get your things together." We quickly threw on our clothes, grabbed our copies and headed out laughing. I have to admit, we were scared shitless that that woman was coming down those stairs to see us doing the big dirty.

Definitely! If we plan on fucking in the water, e.g. when we visit a spa where we like to fuck in the late evening in the outdoor pools, we always take silicon based lubricant with us. It's a game changer!
But for the boat trip a really horny wife with a wet pussy and some patience was enough to get my dick into her ;)

Part time job
 

When I was a college student I was lucky enough to get a part-time job a a rec center, it paid little more than minimum wage, but it was a nice gig. I was to man the place from 4:00 to 9:00 5 days a week, wipe down the gym equipment, rack the pool table, this took about a half hour, then the rest of the time the place was empty, so I could use it for paid study time. If someone did show up, which actually happened occasionally, they set of a chime on the door downstairs.

One day I showed up for work just as the two girls were leaving from a workout, I knew one of them, Della, fairly well, I shared classes with her and we had been on projects together. He father was a prominent surgeon in town, she lived a few blocks away, I had been to her house for a party once.We chatted for a few minutes, she wondered why I was there and I explained my job to her, she said maybe she'd drop my to keep me company sometimes. Since exams were almost over the job was even more boring, I told her that would be great.

Sure enough, a few hours later, I heard the chime ring downstairs, steps on the stairs and Della comes in. She still has workout clothes under a sweater, I presume she is there to work out. I'm sitting at a desk and Della leans and gives me a kiss, of course I respond, next thing is she is sitting in my lap and our hands are going everywhere.

Della tells me a surprise, she said she's been coming here since she was a kid and one of her earliest fantasies was working out nude under the watchful eye of a trainer. I tell her that I can help her with that, she starts to remove her sweater, I tell her to stop, that's her trainers job. I peel off her sweater, then the top of her leotard, her boobs are gorgeous, she covered up her nipple until I reached up to remove her hands. Then her leggings can down revealing a thin light broth bush. We kissed and caressed, she tried to stroke me, I let her, then said "only if you do your exercises well."

I played around with a few machines, I got undressed as she exercised, then I put her on the machine that she has to force open with her thighs, that open pussy with clit dangling wsd too much, I get between her legs and licked her clit.

I was glad she had condoms, I had not though for a second that I was going to get laid at work. We had a few more adventures until the rec hired reak instructors for the summer and Della went to Europe with her family.

Nothing "creative" for me; just the "usual" sex on the beach.

It was Orient Beach in the middle of the night. No one around to see us.
My wife and I had been drinking all evening and were making out in our room. It was actually her idea to go for a walk on the beach...bottomless. So I just put on a T-shirt and she put on a short dress.
We start wading and running in the ocean. She pulls her dress up over her ass. We start out by holding hands; and then she switches to holding my cock. So we're now wading cock-in-hand. When I'm good and hard, she jumps in front of me and bends over, still holding my cock and directing it inside her...it was fun!