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Does anyone know any good forums to discuss Japanese porn and stars like Ichigo Milk?

Yes.
There are a lot if you can comprehend (or translate) Japanese.
But if you prefer to scribe in English, there are three of which I am aware. I link to them on my U.S.A.-based adult bookmark page:
? Japanese magazines
? Japanese movies & videos
? Asian Ladies of the Internet
Try these.

Thanks. I'll have a look at those.