We had this problem about 10 years ago with a recently divorced man as a tenant. I swear that man was paying his companion as NO one could possibly have that many orgasms. Every 45 mins!! He must have been taking little blue pills or..... we still laugh about it.
Nevermind. We sent him a note and added that the people in the next BUILDING could hear them. The poor man was so mortified. We do not have double-glazing as it's a period building and his bedroom window (as the rest of the building's) overlooked a courtyard which just amplified it all like natural theatre.
Every new tenant gets the 'noise travels' bit from us now!
They likely do no realise... so best to play it safe and mention it. People who move from more fortified residences into park homes, densely packed bungalows or flats often do not realise how sound carries.
Heated Brush recommendation,please.