It's hot, you want to get healthy or just perve on hot men. So you go to a public swimming pool. If it's indoor you pay the huge fees, if its outdoor you step over towels and esky's until you get to a crappy grassy spot in the midday sun. You jump in amongst the hoards of people only to brush up against him. Ewwww
Well to add to your woes, an average public swimming pool contains more urine that fluoride. And of that urine you swallow about a cup everytime you swim... Keep your mouth closed.