Speak Louder and Clearer!
Do you know a quick way to get people to stop making so much bedroom noises? Do what this guy did. Instead of telling his neighbors off or threatening to report them to the police, say that you enjoy listening in. Tell them that you have just as fun alone listening to what the two of them do together.
However, there are risks in taking this course of action. Either A) they’ll complain about you to the landlord, or B) they’ll call the cops. However, the possibility that they’ll stop being so loud is real. At the very least, they’ll keep the “chatter” down.