How can we find a japanese av girl?

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how can we find a japanese a girl?As i know,we can only find out their movies and photos on google,yahoo,soso and so on.but we can't find out their contaction way.If we want to talk to them,we could not do anything,just watching their video.So i want to know how to contact to them,just like msn,TM,or online chat software,if anyone knows that,please tell me!Thanks!