"Horinouchi soapland, slender girls" — some people hear that and instantly know what's up, and some don't (soapland is a bath-based full-service format).
I'm 42 and still out there working the floor of this world, so I'll lay it out from a real, on-the-ground point of view.
Why this topic matters
Fuzoku info is surprisingly badly organized. Beginners especially tend to end up not even knowing where to start looking.
What this actually means
In a word: knowing versus not knowing changes the quality of the whole experience.
What I've written here is the distilled essence of 20 years of accumulated know-how.
Last word
Questions about this topic? Drop them in the comments or on social. And give First Class Ruby a look while you're at it.