This seems like one of those ideas that could have been cool on the web of 20 years ago, but just won't work now. Internet users aren't trustworthy anyway as a whole when given anonymity. This is quickly going to turn into a stream of porn, most likely of the illegal variety that you don't want to be caught hosting.
For the time being I'm getting a surprisingly low porn rate (less than 10%). There will always be some jerks, but one of the Web 2.0 principles is trusting the community to balance the content out.