I think the boundary is somewhat fluid. Haven't seen actual inappropriate behaviour in a spa yet (and I think especially saunas are mostly spurring the imagination of people who never visited one: you're usually too exhausted from the heat and/or humidity to even want to do anything)
However it's clearly a place for couples to go to and especially in the actual bathing area (i.e. not the saunas), you can whitness a lot of "public displays of affection".
Whether this this upsets you or not, is something that everyone has to decide for themselves I guess.
Seems to depend on demographics. The more you go towards early 30s expat age, the more likely you are to find that behaviour. Went to a spa in Berlin where I thought your description was quite accurate.
Otherwise I’d say it is actually precisely as parent poster described it. If you go to less “trendy” places, you’ll find you can really relax.
Yeah, I think my spa was one of the "trendy" ones. They did put up signs reminding people not to have sex in the pools, though they weren't at the "guards" stage yet. So I imagine there must have been some incidents.
As I said, it was more an issue in the (textile mandated) bathing area, not so much in the textil free saunas though.
It's good to know there are still other spas around.
However it's clearly a place for couples to go to and especially in the actual bathing area (i.e. not the saunas), you can whitness a lot of "public displays of affection".
Whether this this upsets you or not, is something that everyone has to decide for themselves I guess.