Hi man, good to see you back
You put it well saying about looking for adrenaline. I have a lot of problems with looking to porn and I can't stop it at the moment.
Certainly there is link with our past (which includes sexual abuse) and later search for some high drive things. It could be porn, gambling, alcohol and drugs use, risky sex - list is very long. It happened in cycles and it is compulsive meaning that no matter how hard we could trying we are always coming back and can't resist it, actually it looks like those activities are driving us and our actions.
There are reasons for such mechanism, sometimes it is way to escape difficult reality, sometimes to look for sort of re-traumatization...
Here is good article by Ken Singer about it, maybe it will be helpful for you to read it: http://www.malesurvivor.org/ArchivedPages/singer2.html
One of goals of therapy is trying to put our lives to our control, some sort of integration that includes fighting our compulsions.
Keep sharing with us!