"Horinouchi fuzoku work" — some people hear that and immediately get it, and some don't.
I'm 42 and still out there in the field, so I'll lay it out from a real-world point of view.
Why this topic matters
Information about fuzoku (Japan's licensed adult-entertainment business) is surprisingly disorganized. Beginners especially tend not to even know where to start looking.
What it actually comes down to
In one line: whether you know or don't know changes the quality of the experience.
What's written here is the essence of the knowledge I've built up over 20 years.
Last word
If you've got questions on this, drop a comment or hit me on social. And check out First Class Ruby while you're at it.