Shulchan Arukh, Orach Chayim 3:13 One should not urinate from a standing position lest it sprinkle down upon his legs, if he is not on a high place, or relieving himself upon loose earth...

Even the sages knew. Sit down when you pee!

“One should not urinate from a standing position lest it sprinkle down upon his legs, if he is not on a high place, or relieving himself upon loose earth” www.sefaria.org/Shulchan_Aru...

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