The escort scene is a thriving one and you can also find prostitutes in bars, clubs and on the streets touting for trade.
The Kogane-Cho and hindodecho areas of Yokohama were once a bustling red-light district but city authorities have been working to reduce the number of one-woman brothels chon-no-mas.
Certainly some establishments do not permit entry to gaijins and those that do have been known to charge a surplus to westerners.