Josh Lane was addicted to porn by 14-years-old after first finding it via a Google search when he was aged 12.
He told Newsnight the addiction caused him to isolate himself from friends and family because he was "afraid of anyone discovering that I was hooked."
Mr Lane described finding "the only place I could get, I guess, love and intimacy was from pornography" at the same time as feeling "heaps of guilt and shame"
Now 25 and happily married, he has not looked at porn in almost a year but said the addiction is "a problem that affects you forever".
Kerry Smith, CEO of the Internet Watch Foundation, said "children's exposure to extreme or violent sexual imagery can normalise harmful sexual behaviours, and is increasingly linked to sexual violence against girls and women".
She added: "It is clear this is something we all need to be taking seriously, and the safeguards adult sites have put in place to make sure children can't access sexual content must be robust and meaningful."