In a wilderness hot springs with my wife in my lap, less than 10 ft. from half a dozen total strangers! The coolest thing (for me) was that my wife initiated it!
On the third floor of a hotel at the railing of the outside hallway leading to the rooms. My wife had a long white skirt on, and I just lifted enough to get inside her from behind and draped it around to hide what we were doing. It looked like I was just hugging her from behind. There was a group of guys that walked by us so obviously we stood still, but finished once they had passed and we’re gone. They all said hello as they walked by.