Open air Onsen is the classic Japanese style, however as {| || || |_} is a very much American person, he's not familiar with such things. He prefers more of a communal showers, private saunas/hot tubs, and a co-ed swimming pool, more or less a very fancy YMCA sort of set up. 

Conversely, M177013 is familiar with bath houses in Korea due to his family there, which has [url=https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2F3.bp.blogspot.com%2F-F1sW4oSm9Nc%2FWSOsN5s8auI%2FAAAAAAAACD4%2FkvtrqnI6rVc3hdGNdrJTb5PqDS0fgfAbQCLcB%2Fs1600%2Fdragonhill2.JPG&f=1&nofb=1]gendered hot-tub and washing[/url] facilities as well as these [url=https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fi2.wp.com%2Fjodyrobbins.com%2Fwp-content%2Fuploads%2F2015%2F01%2Fkoreans-in-sauna.jpg&f=1&nofb=1]rooms with the warm rocks and calm ambiance[/url]. The baths should be a place of quiet relaxation with no noise but the flowing of water, not even music or loud scrubbing. The waters itself isn't just plain heated water, but both medicated and herbal, so you don't even need soap. Just soak and relax.