Questions about social nudity, known as nudism, naturism, or FKK (Freikörperkultur), such as places where it may be practised or how one can participate in or avoid it.

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How common are onsen that require swimming costumes in Japan?

I assumed that you don't need a swimming costume when going to an onsen, but I came across this page mentioning that some places require swimsuits (it mentions Tokyo ones require them more than rural ...