Base housing in Germany was stairwell housing for enlisted and junior officer ranks (such as us). Four stories, with typical quality government construction...i.e., no sound proofing. We were on the second floor (For the Brits, that's one floor below us and two above).
For the three years we lived overseas, we had the same couples below and above us. We knew when the upstairs couple was having sex, when their dog jumped off the bed, everything. So, we figured the couple below us could hear the same thing, but we didn't care.
The girl below us was very vocal, but, well, not very reliable. Sometimes, she'd yell out "No, No"; other times, it was "Yes, Yes". Once we heard the bedsprings start, we'd take bets on which Gloria would yell (we knew her name was Gloria, because once she locked her hubby out and he pounded on the windows, yelling for "Gloria" to let him in).
We were friends with the couple upstairs (they had an adorable baby daughter, whom our beagle-mix just loved). When the wife mentioned they could hear their upstairs neighbors' amorous activities, my wife dryly mentioned that the situation was the same for us, and probably the same for the folks below us. Nothing more was said, but they were a bit quieter upstairs for a while.
Then there was the first week we were in temporary housing in Alaska, in a not-very-sturdy wood frame structure. We had a few mild earthquakes, so the building shaking was no surprise.
One night, though, I woke up and realized the building was shaking...and kept on shaking and shaking. After a few moments, I realized I was also hearing squeaking springs from upstairs that matched the building's shaking. That got my erection started and I began playing with my wife's pussy. When she was nice and wet, I slid into her from behind. The next morning, she asked if we'd had sex or if she'd been dreaming
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