I've not really been overheard... but I did find out recently that when I was still living at home, and my hubby (then bf) came over one evening to help me fix my computer.. I didn't realise my floorboards were squeaky.. so whilst we were shut away up stairs.. we got a little naughty and had a little bit of fun... I thought we got away with it but apparently the 'rhythmic squeaking' of the floorboards, as my mum put it, was a dead giveaway. I was mortified. Thankfully I moved out a short while after that :P
i lived in halls for 3 years so have heard it all and been heard, althought the funniest time was when i was with a now ex boyfriend when all his mates thought it would be halarious to bang and make sexy noises while posting condoms under the door,