I think it is fair to say to most MEN who want to escape from a bad relationship do use porn. The other things you mentioned, drugs, alcohol, shopping/spending money, and gambling, all require money. Porn is now freely available to anybody with an internet connection. And it is much easier to hide and deny the use of porn. What appears to be happening is that SOME men find it easier and simpler to watch porn and masturbate when the wife/girlfriend is away. Then he has used up his sexual desire when she is around. He is no longer a slave to his testosterone and doesn't have to face the rejection, excuses, and judgment of women. Of course, you and I know that porn is a poor substitute for a loving, caring and intimate relationship, but it is an addiction and once acquired is as difficult as any other addiction to shake. Many men addicted to porn, as well as the easy sex associated with prostitutes, don't even realize they are missing out on anything. And many don't even care.