JAV Hub is a Japanese adult membership site with no censorship on any of their videos. Not only are none of the videos censored, but they are also in Full HD formats to stream online or download with no DRM protection. Japanese porn does not get much better than this and it is a reasonably sized pay site with over 300 videos. To the best of my knowledge, all the videos are exclusive, and it is updating multiples times per week.

Source: http://reviewporn.com/