It depends on how you define ‘success’ not how you define pornography. There are working definitions of illegal pornography, for instance. Pornography has been more or less successfully defined since the word was coined a century or so ago with the discovery of erotic images in Pompeii. It means, literally, ‘pictures of prostitutes’. Myaybe there should be a distinction made between the will to enforce and the definition.
“Myaybe”
Maybe I should also pay better attention to spell check.