You're saying that futanari manga is offering a guideline for conducting ones own life?
I'd say that manga is just simple entertainment/escapism which happens to have a wide number of genres and a much wider readership, than anime has a viewership.
It's just entertainment, it can be art, but I don't think there are any sort of deeper zen-like aspects to it.
ps. Popular culture in Japan
does go outside the realm of anime & manga in Japan, you might wan't to look into that...