I try to keep things quieter with my new boyfriend. It's actually kind of hot when he holds his hand over my mouth.
Reminds me of how, in an old apartment where my wife and I used to live in, we had the same problem. We had just gotten home from shopping, when our neighbor upstairs called me up to the second floor. When I got there, he asked me to move the headboard away from the wall. It took a second to realize just what he was saying. He explained how the night before, he could hear our headboard slamming against the wall.
LOL. I've been there too. My wife and I and our first year together, I was 32 and she was 26. We were literally fucking 3 - 5 times a day. Anyways, a Korean exchange student lived directly above us and these walls and floors were paper fucking thin. One of the many nights we were fucking like bunnies and after we finished we heard his bed squeaking for about 10 minutes ... then silence ... then a walk to the washroom and washing of hands. We both laughed out loud really hard because we realized what had happened. Next month he moved out.
I think the neighbors can hear my wife doing that alone from time to time, too. She can really get the bedsprings creaking and squeaking when she's getting off on the bed, or one of her stuffed animals or pillows.