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Just to clarify - it’s a temporary effect - lasts for 3-6 months
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Finns go to sauna at least once every week and haven't gone extinct yet.
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Still there are studies that regular sauna does decrease testosterone production. It's not hard to counter though, ice packs applied to testicles ( not direct ice, ice in a cloth) during sauna are effective for that purpose.

And maybe Finns don't go to sauna when they plan to conceive? Does Finland have a lower rate of unwanted pregnancies?

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Finland's fertility rate drove off a cliff in the 60's like in so many other countries. If sauna has an overall effect we wouldn't know as we've nothing to compare with -- going to sauna is rather universal and the tradition is ancient.
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Cant be true:

I went to sauna 3 - 4 times a week, ex-girlfriend got pregnant 2 month after cancelling the pill (while I still went to sauna)

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Then I’m gonna start doing it on my death bed!
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