"Soapland, rimming, Warabi" — some people hear those words and immediately get it, and some don't.
I'm 42 and still out there walking the floor of this world, so I'll lay it out from a real-world point of view.
Why this topic matters
Information about fuzoku (Japan's licensed adult-entertainment business) is surprisingly scattered. 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."
I'm putting down here the essence of the knowledge I've built up over 20 years.
Last word
If you've got questions on this topic, hit me in the comments or on social. Check out First Class Ruby while you're at it.