Rob Weiss, the founder of the Sexual Recovery Institute in Los Angeles, says Kirk, Tammy, Rebecca and Josh are not alone—porn addiction is becoming an epidemic in this country.

Rob says porn addicts become hooked on their brains' chemical responses to the stimulating material. "I think of sex addicts as being drug addicts—only their drug is their own neurochemistry, Rob says. "It's what turns them on. … I talk to guys who say that hours and hours and hours go by, and they're not even aware of the time change because they're so filled with adrenalin and dopamine and serotonin."

Contrary to popular belief, sex addiction is not about sex, Rob says.

"It's like a gambling addiction," he says. "It's like losing yourself in the process of it, and the men that I work with, they're lost in the flirting and the looking and the possibilities of what might happen. They may never actually have an erection. But they can spend hours and hours and hours kind of lost in fantasy."