So I was just informed by someone that they personally shot a porn in a state other than Florida or California. The film apparently even won an AVN award. So the answer is, I really don't know. I had heard California and South Florida only, that was what the porn girl I use to see told me, but maybe that's not the case after all. As far as I know, most Porn studios are in California. I am not aware of any filming in Texas, not to say it's not out there.
I'm pretty sure there is no one filming porns in Houston for distribution, but I'd be interested if anyone knows of one????