What happened was that my then wife and I moved into a duplex house where we were the only occupants for a few months until some folks moved into the other side.We got to be good friends with them before long,she was 29 and he was 30,and they were cool folks,but I digress.
What happened was one night about a week after they moved in I was trying to sleep (the ex was at work,3rd shift) when I heard her moaning a good bit,well,it doesn't take a rocket scientist to figure out whats going on,especially since they are less then 6 feet away and only seperated by a goddamm thin wall!!!
Thereafter for nearly 2 years I was able to enjoy listening to them having a go at it,they weren't overly loud hooting and holering like porn stars faking it but they certainly enjoyed themselves,and I of course had no intention of telling them that I could hear every single moan and groan and creak of the bedsprings!!!
Then after they moved and I left the old lady I got an apartment where my next door neighbors were an attractive couple with 3 young uns,they were a bit more discreet as many a couple with kids are,but to me that was even more erotic,especially since I could hear them through the heat vent,they were like clockwork,usually having a go between 11:30 and midnight right after the news went off of the TV usually 2-3 times a week.
I did have some sound files of them,unfortunately they were recorded on an old cassette player and were just not very good quality enough to share here...........I did upload one of them in the past but the rest were just not good quality at all and I have since gotten rid of them

These days I travel a bit,and stay at many a motel,and sometimes I actually get lucky and catch a fuck or two in the next room,alas it's rare but worth the price of admission when it does happen.