Hi all,
thanks for the interesting question and the contributions of my pre-posters... here is my story
Actually I saw people having sex very late, probably I wasn`t at the right places before.
The very first time for me was Nina and her boyfriend, as already described here:
viewtopic.php?f=6&t=4783
I saw the girl masturbating before through her window while she was unable to recognize me, and when she was visited by her boyfriend I was well prepared, and one of the recordings is derived from those lucky summer times where she left the window and the curtains open so that one could nicely see him penetrating her in missionary while she had her legs swung around his hips. Unfortunately, at that time cell phones were just able to do phone calls, so no option to keep those exciting moments for you...
The second time was just a lucky moment at a small bavarian lake close to the small german city where I did my studies. I was just walking around a bit when I saw a couple approaching in their car probably during their lunch break. After leaving the car, they dissappeared behind some bushes while keeping their view on the lake, both just pulled down their trousers and he took her from behind (obviously not expecting that there were a couple of bushes behind them, where I was...

) After two minutes they finished, went back to the car and diappeared again...
At another lake close-by I also saw a young couple in their late twenties. When I passed by they were talking about something related to work, so no erotic warm-up, kissing or anything like that. Some minutes later I saw them going to another bush (that seemed to be more protected to them) she took of her swimm suit and placed it around a branch of the bush, he did the same, and a few seconds later they went into the missionary and he stimulated her clit with his penis for some minutes. Unfortunately, before he penetrated her, she became aware of me, and I preferred to leave urgently, so this time I missed the main part...
Just by chance I became aware of another location where lots of young people have sex, and this are changing cabins in public swimming pools (do not know how this is in other countries, but in Germany changing rooms are mostly not separated any more, so couples can share the same cabin and they do!

) The first time I came from swimming, went to a changing cabin and saw a student couple disappearing in the neighboring cabin. Some moments later, I listened her whispering "Warte, jetzt noch nicht" (Wait...) without me expecting anything behind that. When I finished changing my clothes and wanted to close my shoes I saw only one pair of legs, and because there was a remarkable distance between the cabin wall and the ground I could unintentionally see her with straddled legs riding on him sitting on the bench, and then I noticed an increasingly urgent aspirating moaning, while both tried to stay very silent. I stayed in the cabin and left with them to get a better impression from the girl which was quite cute, blonde and wearing a skirt when they left
After this event I became aware (also but not only from posts in various online communities) that it is very popular for young couples (at least in Germany) to have sex in the changing rooms of public swimming facilities either when leaving or even just in between their swimming visit, but that`s a different story, and apart from the fact that the couples remain mostly silent, it is strictly forbidden to do recordings there. However, I have also seen already that couples make use of darker or less frequently visited regions within swimming pools such as flow channels (when switched off) or caves, especially in the evening in outdoor parts of the swimming region while rhythmic movements can be seen.
Another intresting observation I made some years ago is not directly related to couples having sex but to women masturbating in public using the jacuzzi devices coming out of the wall of the pool, especially in those where no bathing suits are required...
You might have been wondering why women sometimes stay quite long at such a jacuzzi jet beeing just at the right height to reach the region in between her legs

and try to avoid severe movements by the water that might change their position. As a lot of modern baths have those jet tubes
I noticed this kind of stimulation quite often. The woman stays with the face towards the wall in front of the jet tube (there is hence no excuse to have a massage of their back), hanging on the pool edge and sometimes I even noticed that they lay their head in between their folded arms placed on this edge to prevent that someone might become aware of their excited expression in their face

In most cases where I observed this, this were young to middle-aged women either in absence of other people, sometimes with their female friends, and one time I even noticed that a boy was fixing his girlfriend just in front of the jet, standing behind her and kissing her...
Would be interesting to learn whether any of the women in this community have used this techinque already...
