Over the years, over-amorous couples have been caught having sex on trains, having sex in clocktowers, having sex on the top of buildings - even having sex in cathedral grounds.
But on a water slide? That's definitely a little bit different.
Staff at a Polish water park at Opoczno were shocked to discover the as-yet unnamed pair "failing to get a room" at the bottom of one of their water slides - all while still wearing their swimming caps. Always best to wear protection, eh guys?
"They were at it for a good five minutes before anyone realised what was going on in what must have been a breach of the water park rules," said one lifeguard.
But all that hard plastic? Surely that would have stopped them, with the squeaking and the pain and so on? Apparently not, with the couple eventually removed by on-site security.
"This is a family pool and water park and we want everyone to have fun," said one pool spokesman, "but not that sort of fun."