"Saitama, fuzoku, applying" — some people hear that and immediately get it, others don't.
At 42, I'm still out walking these grounds in person, so I'll sum it up from a real-world point of view.
Why this topic matters
A surprising amount of fuzoku (Japan's licensed adult-entertainment business) information out there is poorly organized. Beginners especially tend to end up not even knowing where to start looking.
What this means in concrete terms
In a word: 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 up over 20 years.
Last word
If you've got questions on this topic, drop a comment or hit me on social. And check out First Class Ruby while you're at it.