Did not have any massive problems with neighbours in various apartments I have lived in. But I've lived in dorms for several years... and uh.. well. Suffice to say, it was quite wild.
Our next door neighbour used to invite her boyfriend for weekend. She was shy nice girl... but nobody had told her sex was not about shouting at the top of her lungs.
Apparently, as soon as the guy was "in"... she started screaming, rhythmically, wailing Aah-aah-aah! for some five minutes or so. And at the end a loud bass of a man 'huh-huh-huh!' joined in.
Dorms are usually very silent during weekends, and the sound carried through the whole third floor.
My and my wife-to-be always a had a ciggie afterwards. We felt we deserved it