It is important to make the difference between the two types of baths in Japan:
- Onsen (Japanese Hot springs) : excellent natural spring water, coming from volcano natural springs, often times located outside (they are so called rotenburo) and sometimes in natural environment. They historically started at the end of the 7th century.
- Sento : cities’ districts’ public baths, lots of them were used before the arrival of individual home bathrooms before the mid-half of the 10th century, but they are still trendy today, even in big cities.
These traditional habits are particularly appreciated by Japanese people who happened to be really at ease with nudity in these situations.
Most of Japanese public baths are single-sex and forbidden to tattooed people (even very small ones): the solution of private onsen ends up being essential then in order to enjoy the experience.