The city 40-year-old said his compulsion to secretly download pornographic images for hours on end almost wrecked his marriage and career.
In a bid to help others kick similar sex addictions, he told The Herald how Plymouth Sex Addicts Anonymous (SAA) stopped him destroying his life.
The city SAA group is one of about 900 worldwide which aim to help people recover from destructive sexual behaviour.
Pete, whose name has been changed to protect his identity, said that three years ago his wife and daughter came close to leaving because of his addiction.
He said: “It culminated when my wife found pornography on the computer by accident and knew right away I’d been lying to her for years.
“She told me to find a way to stop or they would leave me. Even though I was in a good marriage with someone I truly cared about, I thought of saying: “just go” so I could use pornography.”
At that point he was spending three-hours-a-day downloading images and videos onto his computer.