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.

I'm doubtful that Sex and Zen is really going to be a porn film. The original, which starred voluptuous Hong Kong starlet Amy Yip, was merely a Category III softcore comedy about a scholar with a small penis who swaps his junk with a horse (literally ... ) and goes nympho. Sun's film has a budget of 3.2 million, which seems like an awful lot for your standard adult film filled with real sex acts.

Caligula, on the other hand, did have some genuine porn elements in the uncut version -- but Brass didn't shoot them. Instead, they were the work of producer and Penthouse magazine founder Bob Guccione.

Hustler is working on a 3D hardcore version of James Cameron's Avatar. That will definitely be pornographic. It won't be the first, though. Earlier this year, Euro-porn producer Mark Dorsel (link NSFW) gifted us all with Kama Sutra, which starred Brigitte Lahaie. But wait, that wasn't really the first either. Back in the '70s you could watch "John Holmes come right out at you" in Disco Dolls in Hot Skin. I bet there was a lot of ducking during those screenings ...

I don't know about you, but I'm okay with porn staying in two dimensions. What do you think? And more importantly, what should Hustler call their porn version of Avatar? I'm at a loss on this one.