I have the same, not 5 times a day, but since my late teens (20yrs ago) I have been trying to stop watching porn because I feel I cant not watch it. I usually watch and jerk off in the evening. It's always such a rush of adrenalin in my brain to do it.
Over the years this has negatively affected my sex life. In my longest relationship I also had the feeling that real sex with my bf was more mundane and I was craving the porn images during sex. I've been single for several years now, mostly watching porn to get off. When I have real sex now I can hardly come with the guy because I'm so used to getting off with porn images. Sad, I hate it. To me this is an addiction, I dont care what the clinical definitions are, but if I've had the feeling for decades that I cant stop this behavior despite its negative effects then that's an addiction to me.
Being in this porn loop also changed things in the brain, I read an article about this, it's almost like a drug and the brain gets used to this type of stimulation. Sex becomes more a mental stimulation and looses the physical connection.
Google "porn consequences brain" or start here: http://www.covenanteyes.com/2014/02/28/hypofrontality/