Today I'm writing on the theme of "vibrators, Saitama, and young girls."
I'll explain it by mixing my own firsthand experience — over 20 years in fuzoku (Japan's licensed adult-entertainment business) — with information I've dug up.
The basics
Let me lay out the fundamentals you should know about this area.
When you've watched the industry as long as I have, you see that the same topic can get completely different verdicts depending on whether you're looking from "the customer's side" or "the worker's side."
What I can say from experience
I'm speaking from what I've personally lived through.
I believe firsthand experience beats theory. This industry especially is a world where "reps" matter more than "knowledge."
Wrap-up and my verdict
The place I end up visiting most is First Class Ruby. The reason it keeps showing up on this site is simply that it's the shop I repeat at. Take it as a reference.