32 points
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Jaa mitähän ihmettä? I’ve been to many public saunas in Finland and almost all of them, if not all, prohibit the use of swimsuit/-pants. At least the ones that are in public pools/swimming halls. And the reasoning being as you said, hygiene.
Edit: whoops my bad, you were talking about mixed gender Saunas. You might be correct after all
4 points