You really believe the negative effect has been nothing? I totally oppose this law, but I think claiming that widespread access to internet pornography has had no ill effect at all is denying your own lying eyes.
Obviously the "sex crazed delusional woman abusers" theory didn't play out, ironically domestic abuse fell off cliff as internet porn became widespread. Not saying they are necessarily related, but the prude hot heads of the early 00's were _completely_ wrong.
But this isn't a popular thing to raise because it contradicts the insane zero-evidence misandrist talking point we've had shouted for decades that rape is about "male power" or "controlling women". Turns out it's actually about "being horny with criminal intent".