Empty Middle Seat
Not a flight attendant but I once hooked up with a serviceman on his way to active duty in the Middle East while we were over the Atlantic Ocean. There wasn’t anybody in the middle seat. So between them turning down the lights for the overnight flight and the blankets we had, it wasn’t that hard to be discreet.
No way would I do it in a plane bathroom, though. Those things are nasty.
Story credit: Reddit / [deleted]