There is not much for Japanese women to gain on TAG.
We don't even have many Japanese male members (who's first language is also Japanese).
Basically, Tokyo Adult Guide is a site that informs foreigners about fun (adult) places that are accessible to them. This could also appeal to foreign woman because of the information about happening bars, fetish parties and some more normal things, and to ask advise about Japan in a language they understand. It could appeal to a handful of Japanese men because of the foreign escorts on here maybe or something like that.
But in general, for Japanese people, if they want information about Japanese adult venues, why would they limit themselves to the ones that are open for foreigners. They can search endless information in their native language on Japanese forums and websites. Its a lot easier for them!
Some Japanese women may want to find a foreign boyfriend/sexfriend/one night stand but they can use a dating app with many foreigners like Tinder, or go to the Hub or Gaspanic. These options are better than TAG because they can see directly what the guys look like. Even if they want information about happening bars with a lot of foreigners or something, they could google that in Japanese and probably Bliss Out would be mentioned and they could just check that out. There is really nothing i can think of on TAG that Japanese women might look for except if they have special services to advertise.