“SENTO” is a Japanese public paid bath.

In Edo period, almost building were made of wood and there were many fires.

Even ruling class “Bushi” are permitted to install a bath only in Samurai residences called “Bukeyashiki”.

After that, because it was diffecult, from the management perspectire,
to establish separate baths for men and women, people would baths together irrespectire of sex.

Inparticular, the zashiki(Japanese style tatami room) was established on the second floor of the Otokoyu(men’s bath)
and they were used as part of a social occasions, for example play “Igo” and “Shogi” (Japanese board games).

Also, never to mash in buth tub of “Sento”.