WWW- Michael Leahy had an affair, not with just one woman, but with thousands. He said his affair was with an unshakable pornography addiction, and it eventually ended his marriage.

Leahy now travels the country to colleges and some high schools telling of his former weakness and its negative effects on his life. Thursday, Leahy brought his story to Lakeview Academy and spoke to nearly 100 parents and students.

The 47-year-old, whose story appeared on ABC News’ “20/20” two years ago, compared his porn addiction to kryptonite, the green glowing element that brought Superman down to mere mortal status.

“Internet porn is the crack cocaine of sexual addiction,” Leahy said in the “20/20” interview.

Leahy, the father of two sons ages 19 and 11, said he was first introduced to pornographic images when he was 11 years old. He began to indulge in the addiction for more than a decade before he was married to his now former wife, who never knew about Leahy’s fascination with porn until he confessed.

The addiction also can act as a substitute for dating, leading some teenagers and college students away from forming relationships, he said.

“It distorts your relationships and starts to erode away real relationships in your life,” he said.

The average teenager is exposed to nearly 14,000 sexual images and messages per year, he said, and while Hollywood puts out about 350 films each year, the porn industry kicks out nearly 11,000 titles.

“We’re trained to respond to sexual imagery,” Leahy said. “Sex sells.”

Leahy said he has administered some 13,000 surveys to college students across the country. In them he asks how old each student was when he or she was first exposed to pornography.

“I’ve seen some answers of 6 or 7 years old, and that’s way too early,” he said.

Porn addiction, historically connected to men, also can be a problem for women. One female at the University of Nebraska stood up in front of 300 peers at one of Leahy’s speaking engagements and said she had “mentally raped hundreds of guys before even starting college,” he said.

He challenged parents to have a conversation with their children about pornography and its accessibility on the Internet.

“There’s a tendency to be silent,” he said.

Leahy’s appearance Thursday was the second in a series of seminars at Lakeview Academy on Internet safety and awareness. He is the executive director of BraveHearts LLC, an organization founded to increase the public’s awareness of long-term consequences of porn.