Most domestic crimes or crimes by "non career criminal" usually starts out by some small issue and escalates, thats why when cops deals with loud music or a loud fight, and yes even loud sex, it should not be taken lightly or poo pooed on so readily. Should we get upset when the government deals with loud jets and planes and puts restrictions on these vehicles and where they can fly to keep the noise down? Should we get upset when the government builds walls next to freeways to keep noise down? The answer is of course not.
They aren't banning loud sex, they are trying to keep the woman from being a disturbance. The couple can easily sound proof their room and or drown out the noise with some music or a fountain or just stick a pillow in her mouth!