SquiddyCracker
Banned
This was my other second theory.I think there is a historical reason why Japan does appear quite odd:
Keep in mind, Japan was the only "developed" nation of the 20th century that was not European-descended.
We think European cultural things are "normal" because it dominates the world and is the majority.
All the other nations that are getting close to "developed" status today did so more under a globalized, Westernized world. As such, their media and modern society are going to seem far less odd.
It does seem like it's simply their culture (the ancient tentacle porn painting kinda supports this), and that it has simply continued to develop just as ours has.