"Saitama fuzoku" — some people hear that and it clicks instantly, and some don't.
I'm 42 and still out there working this world on the ground, 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 disorganized. Beginners especially end up not even knowing where to start looking.
What that means in concrete terms
In a word: "whether you know or you don't 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 check out First Class Ruby while you're at it.