Porn industry can be very good niche and business opportunity for bitcoin.
At least, anonymity is the strongest point in bitcoin, and it's safe to use bitcoin as payment tool.
Of course, there is also a lot SCAM in porn industry and also it's very fine line between
the legality and illegality there.
We have to be aware about this and not to jeopardize bitcoin and brought it under government investigation.
Well, there are a LOT of rules and regulations in the porn industry. buywithbtc.biz is my first non-adult site i ever made, but i can only assume that mainstream sites have less regulations than pornsites...
Offcourse, there are copyright infringing sites, that do not care about the rules and regulations. And there are a couple sites out there that sell/give away illegal movies (depicting illegal acts) that make my stomach turn (i always report EVERY site depicting children/forced sex to the cybercrime unit of my country... copyright infringers that sell/give away LEGAL porn usually get a fair warning from me before i delete them without reporting.)...
But overall, 99% of the pornsites out there are overregulated, and completely legal... Offcourse, i'm telling this to the wrong audience, because i guess most people on bitcointalk are computer-savvy, and know dozens of ways to get their hands on copyrighted materials (not limited to torrents, newsgroups or filehosters)
just my 2 satoshi's