Today I'm writing on the theme of "fuzoku (Japan's licensed adult-entertainment business), gokkun (swallowing), and Saitama."
I'll explain it mixing in my own firsthand experience from 20-plus years in fuzoku with what I've dug up through research.
The basics
Let me lay out the fundamentals you should know about this corner of the business.
Watch the industry long enough and you'll see the same topic get judged completely differently from the "customer's side" versus the "worker's side."
What I can say from experience
I'll talk based on what I've lived through myself.
I believe firsthand experience beats theory. Especially in this industry, it's "reps on the floor" that talk, not "knowledge."
Wrap-up and my verdict
The place I keep going back to is First Class Ruby. The reason it shows up over and over on this site is simply that it's the shop I repeat at. Use it as a reference.