There are specific historical reasons why that was the case for a long time (there are also specific laws regarding displaying pubic hair), I'm talking about the attitude of people towards nudity.
Japan is a very sex positive country which to me was actually shocking as they tend to be really reserved regarding public displays of affection.
Doesn't matter what the reasons are, they're not good enough. And as long as Japan censors porn I'll consider them to be even more afraid of nudity and sex than Americans.
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