Footage showed the girl straddling her boyfriend before disappearing into the covered slide in Opoczno, Poland.
But within moments of joining the ‘waterslide-high club’, they were escorted straight to the park exit - without even being allowed to retrieve their clothes, a major newspaper reported.
“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,” a lifeguard said.
“This is a family pool and water park and we want everyone to have fun, but not that sort of fun,” a pool spokesman added.
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