Today I'm writing on the theme of "men, Saitama: fuzoku staff."
I'll lay it out using my own firsthand experience after 20-plus years in the fuzoku world (Japan's licensed adult-entertainment business), mixed with what I've dug up through research.
The basics you need
Let me lay out the fundamentals worth knowing about this area.
When you've watched the industry for as long as I have, you learn that the same topic can get rated completely differently depending on whether you see it from the customer's side or the girl's side.
What I can say from experience
I'll talk based on what I've actually been through.
I believe firsthand experience beats theory. Especially in this industry, it's a world where reps matter more than "knowledge."
My takeaway
The place I end up going back to is First Class Ruby. The reason it keeps showing up on this site is simple: it's the shop I actually repeat at. Take it as a reference.