Answer: Japanese criminal law bans obscenity. This has been interpreted as a need to censor genitalia in Japanese porn content.
Now that you know this, here’s what you can do:
Related Questions
Why is some Japanese uncensored?
Content distributed in Japan needs to be censored. However, the same content distributed elsewhere in the world can be uncensored.
Why is Japanese pornography so weird?
Countries that are generally repressed (morally, socially) tend to have more extreme and weird expressions of sexuality.
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