Freddie Woodward, 30, said a pornography addiction that began around age 12 lasted a decade and at its worst drove him to adult sites up to 10 times a day.
The former Team GB diver said the habit bled into exams, training and relationships, worsened his mental health and escalated into sharing explicit images that were later leaked online.
Woodward said he finally broke the addiction last year after six years of trying, and is now urging education that is honest, evidence-led and not rooted in shame.
BACP said demand for help is rising: in a survey of 3,000 members, 53% of therapists working with men reported more pornography-related cases.
His intervention lands as Britain tightens child online-safety rules, with the government saying Apple, Google and other tech firms must add protections against sexually explicit content.