"Men's job listings, delivery health driver, Koshigaya" — some people hear that and it clicks right away, and some don't.
I'm 42 and still out walking these grounds in person, so I'll lay it out from a real-world point of view.
Why this topic matters
Information about fuzoku (Japan's licensed adult-entertainment business) is, surprisingly often, a disorganized mess. Beginners in particular tend to end up not even knowing where to start digging.
What this means in concrete terms
In a word: "whether you know it or not changes the quality of the experience."
What I've laid out here is the essence of the knowledge I built up over 20 years.
In closing
If you've got questions on this topic, hit me in the comments or on social. And check out First Class Ruby while you're at it.