In flight pleasure - with crew member?

My ex of many years once was shagging a cabin crew member in the bunk of a 400. Has any of you had a similar encounter in flight? Just trying to find out whether it happens from time to time - or all the time:-)) Doing this with me would have been ok, of course... I left that lech after all, wasn't keen on catching anything nasty. But out of curiosity: is this anything out of the normal or do they do it?