When I studied in GB I lived in a community house. Sporadically I heard the couple next to my room fucking and moaning loudly, SURELY INTENTIONAL for the rest of us to hear :-)
In Germany we have the common phrase : "Stille Wasser sind tief" = water with little or no movement/currents are motsly very deep :-) (referring to the copmparison bricks and rivers "vs" lakes and wells