Dad has recently gotten himself a much younger girlfriend whom he has moved in last month. My bedroom and their bedroom are wall to wall. The fact that they fuck doesn’t make me uncomfortable - so happy for them, but they do it on max volume. No joke. Every night at 11 and in the morning at 6 on the clock. These walls are paper thin apparently.
Get an airhorn and when they get super loud give it a few blasts and scream “gooooooooaaaal!” At the top of your lungs. Max volume. Do it each time they get loud. If they ask you what you’re doing say you’re watching Euro footie.
Genuinely I think the right answer is to have something really loud and off-putting for them (especially her) and an air horn perfectly fits the bill.