Today I'm writing on the theme "What decides whether you can earn in fuzoku? Shop choice, shift days, and how you work." (Fuzoku is Japan's licensed adult-entertainment business.)
I'll explain it by mixing my own firsthand experience of 20-plus years in fuzoku with what I've turned up through research.
The basics
Let me lay out the fundamentals you should know about this area.
Watch this industry long enough and you'll see that the same topic can be rated completely differently from "the customer's side" versus "the girl's side."
What I can say from firsthand experience
I'm speaking from what I've actually been through myself.
I believe firsthand experience matters more than theory. This industry especially is a world where "reps" count for more than "knowledge."
Wrap-up and my conclusion
The place I end up at most often is First Class Ruby. The reason it keeps showing up on this site is simply that it's a shop I keep going back to. Take it as a reference.