I definitely helps that most attendees are not particularly attractive. But as soon as an actually attractive girl/woman is present - I do have to manage my attention to avoid ... ahem ... drawing unwanted attention. Happens very rarely, though. And I'm saying that as someone having gone to the sauna for many years.
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just to be clearer - I never go to the sauna with sexual intentions and never ever made anybody feel uncomfortable for sure. I just don't find this often proclaimed "saunas are asexual" credible. they can be very sexual and many people go there with that mindest - as far as I can tell (as a man) mostly from the gay community. and for me as a man who very well can admire a firm female body I simply have to say that indeed it helps that there are very few of that kind. most people are old and wrinkled and I just keep my eyes everywhere else.
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also this "naked is cool" but "sexuality is inappropriate" attitude is not fitting the lifestyle and mindest described in the article. it's a prude and artificial take on human life and desires.