So I was walking around my hometown (San Francisco) in Chinatown neighborhood running errands. Finally after years and years of coming thru here, I noticed how many Massage Parlor there are in the area. So I'm wondering is, is there a way to tell if its a legit massage/spa parlor or if it is one that offer some type of HE. The few that I walked by are always covered dark black curtain. Even if you manage to peek inside the doorway you can really see much as it is dark inside and maybe you get a glimpse of the reception counter. Aside from checking online, is there any way to verify if its legit or not. I personally can't tell the difference between each one, however there is one massage parlor that peek my interest as it offer "table shower". Will like to ask more pro punter what the heck it is. As in my head is you lie on a table and get washed up.

Thanks for the help guys