This undated photo provided by Stéphanie Crohin shows traditional baths and murals in Kasuga onsen, or hot spring bath, in Matsuzaka, Mie prefecture, Japan. Japan is proud of its bathing traditions.

Tattoos are still taboo when it comes to sento (communal bathhouse) culture in Japan. While they are seen as an expression of individuality in other parts of the world, Japanese society at large still ...