Apparently, the owner kept losing them in the pool when he had sex, and they just built up each month. It would sure as hell explain why he was never home when I cleaned it.
"If you find any 'balloons' ... my kid had a party."
But picking up the odd renegade c**k ring is nothing compared to a busted hot tub filter, particularly those used by the general public. Whenever a hotel employee called me to change a "busted filter," that was code for "the accumulated money shots of dozens of traveling couples have finally overwhelmed the filter." So I'd have to drain it, disinfect the whole thing, and put in a new filter.
You might find this alarming if you've ever been in one of those hot tubs, but look at it this way: Better for it all to wind up in the filter than floating around in the water with you and your family. Still: Really try not to let public pool water get in your mouth. And not just because of the semen, either ...
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