"Koshigaya soapland, young girls" — some people hear that phrase and immediately get it, and some don't.
I'm 42 and still out walking the floor of this world, so I'll sum it up from a real, on-the-ground point of view.
Why this topic matters
A surprising amount of fuzoku information is poorly organized. Beginners especially tend to end up not even knowing where to start looking.
What this actually means
In a word, it's this: "Whether you know it or not changes the quality of the experience."
What I've written here is the essence of the knowledge I've built over 20 years.
Finally
If you've got questions on this topic, drop a comment or hit me on social. Check out First Class Ruby while you're at it.