Long before cell phone cameras were around, J and I were staying in a very large hotel that had an interior atrium with an indoor pool in the middle. The rooms all had windows that were interior facing. The place was largely empty and we had a fairly steamy R-rated swim. After that, we adjourned to our room and proceeded to "forget" to close our curtains - partially for the thrill and partially because we didn't think anyone would walk by - the place really was nearly empty.
We were wrong! An older couple (by our standards at the time....now they would not be much older than us...yikes!) caught us and briefly enjoyed the show but moved along fairly quickly.
Of course, who do we pass in the lobby the next morning? Thankfully, just polite, albeit knowing, smiles.
K