(This is a personal post from one of our group members.)
For me, the problem isn't really porn or masturbation or any other particular form of sexual acting out behavior. It's about lust. Sometimes I think it would be better to call our program Lust Addicts Anonymous.
If I am not lusting, I will not turn to porn or masturbation or sex. But because I am an SA, if I am lusting , I will inevitably end up acting out sexual behaviors (which for me includes porn use and masturbating). Focusing on avoiding porn is a solution that is doomed to failure for me as a true addict. Porn use is a result of my lusting, not the cause of it.
For the SA, lust is the drug. God is the solution. The 12 Step program is the path to a right relationship with God, who can and will keep a surrendered lust addict sober.
That's my experience.