"Omiya, delivery health, the girls" — some people hear that and instantly get it, others don't.
I'm 42 and still walking the floor of this world, so I'll lay it out from a real-world angle. Delivery health, by the way, is Japan's outcall adult-entertainment format.
Why this theme matters
Information about fuzoku is surprisingly 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.
What I'm writing here is the essence of knowledge I've built up over 20 years.
In closing
If you've got questions on this theme, hit me in the comments or on social. And check out First Class Ruby while you're at it.