His brain chemicals have him addicted to masturbation and porn. Manipulation with his hand feels better for him. Does he keep porn in the bathroom? Try going somewhere remote with no computers, no phones and no pictures of porn. It will have to be at least a couple of weeks to break the addiction. Retrain him to be addicted to you. Make sure no porn or sexual contact including things like texting with others. Then he may be free of his addiction. He will most likely have more than enough drive to have sex afterward. Otherwise, you can do better. Guys usually don't change.