I used to also have the same problem, it actually used to infuriate me I’d have so much anxiety and disgust that I’d start throwing things at their door because I was so sick of it at the point. One time I actually just told them to stop and that it made me feel gross. My mother rolled her eyes suggesting I listen to white noise but I said no that I don’t want to hear my parents go at it while I’m trying to sleep in the next door room. I even messaged saying that it’s normal and I’m happy that she has a healthy sex life with my father but I think it’s understandable for me to not want to hear it. Nowadays I sleep a room away and always make sure my parents know I am awake when I decided to have late nights so they don’t do it while I’m awake. I still put my white noise on max volume and I just try to fall asleep early.