You started off by asking about technological solutions, but my first observation is that this isn't a problem you can likely solve by those sorts of means.

My second observation is: is it really a problem? Most of the supposed porn-addicts I've known have not actually fit the definition of addiction, "pleasurable but the continuation of which becomes compulsive and interferes with ordinary responsibilities and concerns, such as work, ...". Is it really an addiction? Are you late to work because you're watching porn? Do you find you don't have time for anything else because you watch porn? I can only figure that the US's puritanical roots cause people to so frequently conflate daily porn use on the order of 15 to 30 minutes with "addiction", when it clearly will not fit the bill for addiction.