"The Yoshiwara red-light district" — I figure some people know exactly what that means, and some don't.
At 42, I'm still out walking the floor of this world, so I'll sum it up 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 in particular tend to end up not even knowing where to start looking.
What this means in concrete terms
To put it in a word: "whether you know it or not changes the quality of the experience."
What I've got written here is the essence of the knowledge I've built up over 20 years.
In closing
If you've got questions on this topic, drop a comment or hit me up on social. Give First Class Ruby a look while you're at it.