
So I tried instead in the "wild". A parking lot in a forest, in the daytime much used by dog-owners. I pinned the usb-device under an garbage can and left the place.
It happens that there ideed was a couple for two hours or so, and you can hear some talking, some heavy breathing and some soft moans (around 25-30min). The time the file begins is round about 22:00. Nothing comparing to the usual standard in this forum. But regarding the fact, that "Outdoor Sex Files" are the least added sound here, I post it anyway.
But beware: the REALLY VOCAL ones are the birds. So watch your ears.