I live in a victorian house that’s been converted into 5 apartments. The walls are so freakin’ thin here it’s not even funny. Of course I didn’t realize that until recently.
I can be sort of a loud talker and laugher but never really though anything of it until recently. I guess my “next door” neighbor never really had company before because I just recently heard her talking to someone through my living room wall. Just talking. I was immediately horrified remembering all of the time my X and I had little ahem episodes right there on the living room rug. I mean, if I can hear her just talking so clearly, I can only imagine what she’s heard.
X an I have broken up since then but needless to say, I still make an extra effort to be super quiet when I have friends over or whatever.
Point is, sometimes you don’t realize how loud you’re really being, or how thin your walls actually are. Neither do your neighbors, most likely. That’s why I think if it really bothers you, just freakin’ tell the “offender” polietly (maybe something like "man, I never knew how thin these walls are! as an intro or something) about the noise before calling the cops, or suffering silently.
And no wild monkey love if you don’t know how thin your walls are.