"Soapland signing bonus, Warabi" — some people hear that and instantly get it, others don't.
I'm 42 and still out in the field of this world, so I'll lay it out from a real-world point of view.
Why this topic matters
Information about fuzoku is, surprisingly often, poorly organized. Beginners especially tend to end up not even knowing where to start looking.
What this actually means
In a word: "whether you know it or not changes the quality of the experience."
Everything written here is the essence of knowledge I've built up over 20 years.
Finally
If you've got questions on this topic, drop a comment or hit me on social. And while you're at it, check out First Class Ruby too.