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How do you dry afterwards? At home you could use some towel, I guess... But in a public place?

They don't.

Isn't that awkward? Your underwear will get wet, and also your skin is moist... and warm. Which is a good place for bacteria to grow?

It dries up way quicker than you might imagine. Especially, I guess it should be quicker in drier climates.

> should be quicker in drier climates

Which the Philippines, where this is widespread practice, definitely isn't.