I wouldn't go so far as uploading whole movies, then. The alternative for me is just having a bit of fun remixing clips for montages or music videos.
It's not a priority for me anyway, and if doing so would still land me in hot water, then I wouldn't bother. I know similar stuff happens on YouTube with regular videos, but that's a separate matter, and JAV copyright may not be the same as TV or movie copyright. Even if there is no monetization for a porn streaming site user, I guess that's no excuse to risk it either.