When it comes to technology, the porn industry is usually ahead of the curve. Yet, for some reason, the multi-billion dollar industry hasn't managed to cash in on the burgeoning 3D craze yet -- but as a news story in the UK's Telegraph points out, the race to be the first is on. Of course, it's not really a race to be the first because there have been several other 3D porn films and I'm not even sure two of the titles being mentioned in the article should really be considered porn in the first place, but why let that get in the way of a good story, right?

The Telegraph article talks briefly about Sex and Zen: Extreme Ecstasy, which director Christopher Sun is claiming will be the first 3D pornographic film. Meanwhile, Tinto Brass is moving ahead with a 3D version of his cult classic Caligula.

Hit the jump to find out more about the history of 3D pornography.