"Omiya soapland girls" — some people hear that and know exactly what it means, and some don't.
I'm 42 and still out there walking these streets myself, so I'll lay it out from a real-world point of view.
Why this topic matters
A surprising amount of information about fuzoku (Japan's licensed adult-entertainment business) is poorly organized. Beginners especially tend to end up not even knowing where to start.
What it actually comes down to
In a word: whether you know or don't know changes the quality of the experience.
What I've written here is the distilled essence of knowledge I built up over 20 years.
Last word
If you've got questions on this topic, hit me in the comments or on social. And give First Class Ruby a look while you're at it.