I've been living in Bangkok for almost a year - and one of the problems I found was locating some of the massage parlours mentioned on web sites and forums. Much of the available information is out of date - MP's have closed, or been renamed, or the directions are in Japanese or Thai.
To solve the problem for myself, my weekend hobby became walking the streets, searching out MP's, writing location directions, taking photos, and mapping locations on Google Earth. Of course, it was also important to make internal inspections to view the products on display, and to sample the services... and to record prices for comparison purposes.
Because information only has value when shared, I've ended up publishing this (free) at
www.nightlife.thaigirlbride-thaiwomanwife.com and there you will find what I believe is the most comprehensive, accurate and detailed information available about turkish bath houses and massage parlors in Bangkok.
If anyone has any suggestions, or can correct any errors, I'd be delighted to hear from them - my goal was to try and make it a collaborative effort for the benefit of all men! :-)