"Saitama delivery health fetish" — some people hear that and immediately get it, and some don't.
I'm 42 and still out there in the field of this world, so I'll sum it up from a real-world angle.
Why this topic matters
Information about fuzoku is surprisingly 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 or you don't changes the quality of the experience.
What I'm writing here is the essence of the knowledge I've built up over 20 years.
Last word
If you've got questions about this topic, hit me in the comments or on social. And check out First Class Ruby while you're at it.