This is something I sort of found out the hard way, or by myself, after having started using my healthy intuition more (finally).
But I suspect, tbh, that it holds true for everyone and that you should start doing it yourself, too.

The Testicles, Heat And Fertility
The testicles, or balls, are located outside the body partly in order to be cooler and not overheat, and they’re as such much more sensitive to excessive heat.
Studies have also shown that hot water (bath or shower) and sauna use lead to large decreases in sperm count, sperm motility and fertility, that can last for weeks.
So if you’re trying to get someone pregnant, stay away from the heat.
Practicality And Intuition

So, to protect your manlihood, how to move forward from here?
I suggest you first tune in to your healthy intuition and feel/notice for yourself that your balls do not want all that heat.
And once you have and are more invested in protecting them, skip hot baths, cover your balls or keep them out of the water when showering, and don’t sit too high up in the sauna or cover them with a wet cold towel.
Wrap-up

Keep it cool, for your balls’ sake :).
/Emil