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illegal
To answer the original question; I'm not sure if it is still true, but I believe japan used to have a law outlawing the showing of the vagina in porn.
Therefore, to comply with this japanese porn makers made their models grow their pubic hair out so that they could still show the pubic area, but not the vagina or vulva.
If you have ever seen Japanese porn that blurred the vaginal area when the girl was masturbating, or during intercourse, it is because you could see the vagina, and that was illegal.
Once again, I'm not sure if this applies to present day Japan, but it used to be like this.
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