Airmid, on the subject of understanding sexual acting out through identifying commonalities in alcohol dependency, I would begin with it is a coping mechanism, dissociating a trauma. In this, any dependency be it alcohol, gambling, porn, cruising and collecting toasters will serve in the same capacity, trying to keep the abuse shame out of the public light, and also out of his cognitive function, his conscious.
Alcohol seems to have been discarded as a way to accomplish this, and as with almost any focal process, what is abundant is general and as it begins to be filtered, it becomes that much more intense, like sunlight through a magnifying glass. He may have utilized many such mechanisms in his life, an abundance beginning shortly after the abuse, and now, he has worked to filter and focus this dissociation to the abuse itself. He may now only have a few, or even one coping mech between him and discovery, processing and breakthrough. This "last" mechanism will be intense, overwhelming and demand an impulsive reaction. If that sounds familiar, it may be that it most accurately reflects the abuse itself. Different from other coping releases, the survivor has nothing else to "transfer" to, so he needs to now confront his memories, mature his hurt and protect himself as he heals. AA meetings can support this as well, using some of the lessons learned can lead to epiphanies into abuse recovery.