I sat in an old movie theatre with old canvas seating. A girl and a guy in the row in front of me. We were all standing for the national anthem. AS she sat down the girl in front slipped her knickers off. She worked her way onto his lap and sat on his cock for most of the movie. "Leave it in me" she said. At derive in theaters (I don't know the US term) people would park their panel vans, with the back hatch door open and a mattress in the back. Some times, when walking back to the refreshment bar, one could see the old 'ten toes up, ten toes down" thing happening.
Television shop doorway at night wondering why people were laughing as much,i didn't realise there was a live feed camera facing the door and our performance was on their big screen television in the main window for all to see.
My answer is a bit crazy. It was a sand and gravel quarry. My knees were raw and bloody. She laid on my shirt. Crazy!
May seem pretty obvious, but it really is a little unsafe to have sex while piloting an airplane. Yea, it IS a way for two people to join the mile high club, but your main focus SHOULD be flying the airplane, not the orgasm. (I was younger at the time, so there is the arrogance of youth thing)