We love going to public sauna’s. (We’re in Europe, it’s mixed and some have a choice between bathing suits and nude, before there are any questions about it). But we always go alone, just the 2 of us.
A while back we were talking about a nice sauna we went to in our group of friends. And afterwards one of them texted that he’d like to go too but he didn’t have a girlfriend and wasn’t really in the mood to go solo. We understood and we told him he could tag along next time we went. So we checked our schedules and came up with a date fitting for all. There wasn’t really any further discussion about it after that. The day before our friend texted us to see if it was all still set to go, it was good for us so that was that. The next day he came to our place and we went to the sauna in 1 car.