I have a JAV video (HAVD790) with subtitles, I'm pretty sure it's not japanese because it doesn't have any kana at any point. And I think it is specifically traditional chinese. I'd be interested if anyone could translate if I screencapped the subtitles (there aren't all that many) as I rarely get to actually appreciate the dialog in JAV.
here's an example:
My interpretation is:
"Still something something something ? huh?
here's an example:

My interpretation is:
"Still something something something ? huh?