Today I'm writing on the theme of "fuzoku, Nangin, small busts."
I'll explain it by mixing my own firsthand experience — over 20 years in fuzoku (Japan's licensed adult-entertainment business) — with what I've dug up in my own research.
The basics
Let me organize the basics you should know about this area.
When you've watched this industry for a long time, you find that even the same topic gets rated completely differently from the customer's side and the girl's side.
What I can say from firsthand experience
I'll talk based on what I've been through myself.
I believe firsthand experience matters more than theory. This industry especially is a world where reps count for more than book knowledge.
Wrap-up and my conclusion
The place I end up at most often is First Class Ruby. The reason it keeps coming up on this site is simply that it's the shop I keep going back to. Use it as a reference.