In my twenties, one of my male coworkers and I would often go out in foursome with the two girls from work we were dating. My bed sit was in the town centre and we would often crash there together, my gf and I in the single bed and the other couple in a sleeping bag on the floor.
One Sunday morning after I had walked my gf to the bus stop, I returned to find my mate going to the bathroom while his gf was still asleep on the floor. He had unzipped the sleeping bag halfway to get out, leaving her exposed from the hip up, though she was on her side, back to me, so I could see little.
I was going to zip it up further to cover her, but as I knelt down, she rolled back halfway on her back. I could see her firm, pointy breasts with neat stiff nipples and just a hint of the top of her pubic hair. (This was the 70s, before women started all this depilatory nonsense.)
It was a very erotic ten seconds or so before I heard my mate returning and I had to move across to the other side of the room, pretending to be looking the other way. As I did, she rolled back to her less exposed position. I have always wondered just how deeply asleep she was
Months later the tables were turned when my then gf, later my wife, tiptoed to the toilet clad only in her panties at about 5am. When she came out, she met my Polish landlord (a man in his seventies) in the hall. He just smiled and wished her good morning, which she politely returned, not even attempting to cover up. I'm sure she made his day!