"Are fuzoku girls (fuzokujo) banned from wearing nails? The OK/NG line and what male clients really think" — some people hear that and instantly get it, others don't.
I'm 42 and still working the floor of this world, so I'll lay it out from a real, on-the-ground perspective.
Why This Topic Matters
Information about fuzoku (Japan's licensed adult-entertainment business) is surprisingly poorly organized. Beginners in particular often don't even know where to start digging.
What This Actually Means
In a word: whether you know it or not changes the quality of the experience.
What I've distilled here is the essence of 20 years of accumulated knowledge.
In Closing
If you've got questions about this topic, drop a comment or hit me on social. And while you're at it, check out First Class Ruby.