It's debatable whether Sex and Zen: Extreme Ecstasy is actually the "World's first 3D porn". (That would probably be Kama-Sutra.) But it's certainly the first 3D porn to hit China. Here's how The Guardian describes Sex and Zen

The £2m Cantonese language film is an ornate fantasy with high production values, set at the kinky court of Ming dynasty ancient China. It is ostensibly based on the classic Chinese erotic text, The Carnal Prayer Mat, and follows a young man as he befriends a duke and enters a world of royal orgies and other sexual peccadilloes.

This has apparently caused a mass migration of Chinese from the mainland to Hong Kong, where they can see the uncut version. First green technology, now 3-D porn? The Chinese are surpassing the U.S. in every field that counts. [Guardian]