You should really leave this note under his door. Let him wonder which neighbor wrote it.

i’d have banged on the wall and told them to shut the heck up.
that would probably work, assuming that these people are even slightly normal and the sound of neighbor annoyance mid-coitus would horribly embarass them.

Perhaps it was a man screaming like a woman. That’s it, no more Will & Grace for me.

perhaps you should mention in the letter that the girl was screaming out something about sheldon… you know.. maybe that’ll stop all activity in his apartment

I had a noisy late night neighbor once (different noises). My solution was to make sure I woke him up when I got up early in the morning. So before you leave a note, make the point stick by waking him up at 5:30 a few times.

When my neighbors go at it, I vacuum.

I’m lucky. My neighbors have been dating quite a while, so they never have sex. It’s like living next door to a married couple.