[Towaway69]

It’s also great for certain mental health issues: spending time naked with a mixed crowd (yes mixed female and male) can be eye opening.

Saunas are a great leveller between humans all living the same experience yet feeling alone in doing so.

[euroderf]

For the record, "mixed crowd" is for people who already know each other or maybe are at some kind of (countryside?) event. Public facilities are segregated by sex, and most private functions with a single sauna will organise separate sessions.

Families will typically sauna all together, altho this system can break down when kids hit puberty.