"Omiya, famous health shops" — some people hear that and immediately get it, others don't.
At 42 I'm still out there walking the floor of this world, so I'll lay it out from a real-world point of view.
Why this topic matters
A surprising amount of fuzoku (Japan's licensed adult-entertainment business) information is poorly organized. Beginners especially tend to end up not even knowing where to start looking.
What that actually means
In a word: whether you know it or not changes the quality of the experience.
What I've written here is the essence of the knowledge I've built up over 20 years.
Finally
If you've got questions on this topic, hit me in the comments or on social. And give First Class Ruby a look while you're at it.