Esute
Esute comes from the English word "esthetic". It often refers to beauty treatment places for women, but has come to refer to Asian massage parlors in the sex business. They are mostly staffed by Korean or Chinese. Look out for signs that say Esute in katakana around larger stations, or you can sometimes see girls hanging around entertainment areas, such as Shinjuku and Roppongi. They will often approach you saying "massagi". Cost, services and conditions vary a great deal from place to place, so be sure to check out what service is included before handing over your cash. The quality of the actual massage may also not be that great, but usually finish with a happy ending! Many of the places listed here have discount tickets to print out.