In browsing around, I realized that I've been in several of the old bathhouses, including the ones at 1015 Folsom and 330 Ritch.
To my absolute shock, I'm about 95% certain that back when we bought the communal household, we came fairly close to buying the space that used to be the Glory Hole at 224 6th. I'm completely stunned by this-- I had no clue! (And no, it's not an April Fools joke.)
Edit: I drove by tonight, and now I'm 100% certain.