Here you go:

https://www.truenudists.com/location/spa-world/

nudism /nudzm/ Brit /njudzm/ noun
Britannica Dictionary definition of NUDISM
[noncount]
: the practice of not wearing any clothes especially in private places (such as camps or beaches) that are separated from public areas
called also (British) naturism

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Yes I've seen it:

Steven Yeun & Conan Visit A Korean Spa | CONAN on TBS

https://www.youtube.com/watch?v=k70xBg8en-4

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That link directs you to Conan's Japanese Etiquette Lesson

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