It is actually a very interesting and ridiculous topic to research. I encourage anyone to do a little Wikipedia research on the Japanese obscenity laws. They have done some silly things. Such as in the 1950s imprisoning the man and his editor who translated an old book, that contained suggestive topics (Young Lady Chatterly). In 2004 they tried 3 artists of a Hentai Manga called Misshitsu.
Oh and be aware that in 2022 they revised their Penal Code regarding insulting someone to include online posts. Anyone who posts anything online that could be considered an insult to another, faces a mandatory 1 year prison sentence.
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It is a fascinating subject. And why they blur out or color code genitalia in wide ranging colors or other forms of censorship.