I would like to share my experience from last Friday in my favorite sauna in Austria, since people are discussing men being aroused.
It is still quite warm here - not the best weather for visiting saunas - but the place was quite busy. Generally an older crowd but some younger visitors and a good male-female mix.
I noticed a couple in the pool, early 40s, quite attractive. The lady had long dark hair, a bold pussy and nice firm tits. When the guy left the pool he was covering his dick with his hand, and indeed had a semi boner. I met them a bit later again in the steam room, and he walked out and into the showers again with a semi full erection. No-one seemed to care. I thought it was fine, the same thing happens to me when I am with my wife, except I wait a while before standing up and walking around
