Yes it was unfortunate because it was the service i wanted the most. massage the girl in oil and nice tight black thong ass. i couldn't find any other service similar to it's. [...]
So...you just need the girl to be in a black thong and douse her in tons of oil? I would think most providers would be totally okay with using odorless oils and a massage...but yeah...thinking about it, you'd need to be able to to ask the girl if it's okay. This coincides with my point below.
I was wondering if you know why the Japanese reject foreign customers? Is it because of spreading disease or something?
Unfortunately, as
@CharlieSimms pointed out, the average Japanese-illiterate foreigner causes more business harm than good. Despite the fact that these girls are sold like a product to you, they feel like and of course ARE still human beings in the end. It's an unavoidable, unignorable fact. And yeah, Japanese guys can be complete assholes to them too quite a bit, but at least the girls can make it clear they hate the way they are being treated without fearing some sort of coercion or confrontation (contrary to the samurai fiction, Japanese culture strives to be non-confrontational, because getting upset is seen as a weakness.)
As a result, when they finish up with someone who they can't communicate clearly with that just used them, one can imagine that it can be depressing and possibly even dehumanizing. Then with foreigners we often come with a dose of body odor, mouth odor, louder scarier voices, generally higher libido, and worst of all: overwhelmingly larger penis sizes (yes, there is enough evidence in this forum based on my experiences alone that confirms that bigger does NOT always mean better.) So...just imagine having a day where you meet five or more smelly, villainous-voiced, difficult-to-please foreign men who you can't even fucking complain to about their jaw-breaking Herculean-boner because they can't speak Japanese? Hell, if I were a female provider, I would probably avoid foreign guys altogether myself, because the risk is just not worth the reward.
Anyway, I get the feeling you actually did some homework this time, but unfortunately it hasn't paid off yet. The sooner you get started on the nihongo, the more of these dreams of yours can come true.