What is a Konyoku bath?

Konyoku bath is a public bath that male and female people can enjoy at the same time. 　There are many locations around Japan, and some of them are operated by local governments. Those are not for sexual activities, but simply a facility for relaxation.

There is no prohibition for foreigners to enter konyoku bath as long as you're fully naked. If you wish to wear some swim suits, konyoku masters may halt you entering the bath.

Unfortunately, there is no English site that explain more about konyoku bath, but please feel free to ask any questions about it to your Japanese friends. It is a common term for most of the Japanese.