Hi! (not sure if correct to resurrect this post)
I've caucasian look and don't speak Japanese. Been today in Nagarekawacho looking for a Soapland, tried to enter 5-6 places, but in all of them I was told "Japanese only". I started from the ones that looked more classy (and expensive, like Diana, or the one that is just right of Diana, or Blue Moon [they are all listed on Google Maps too) hoping that that made them more foreign-friendly (just like Club Amour in Osaka), but nothing. The only one that gave me 30 seconds of hope was Rune B (again, not sure if links are allowed, this is my first post, sorry)
http://rune-b.jp/map.php that approached me but then denied me after I told him I don't speak Japanese.