The argument at face value is a slippery slope, like "sugar triggers dopamine response in the brain in similar areas as cocaine, so any exposure to sugar eventually leads to someone consuming sugar at all times"
I think it's much more likely that people, in general, imprint sexual preferences around the time that they are becoming sexual in their teens, and that doesn't change much as they age.
Religion in the US tends to focus on "any exposure to porn makes you an addict," which is why I am assuming this is what you're trying to imply. If you want to play a semantics game "porn addiction is defined as" then I'd argue that the same people are -true- porn addicts at the same rate that people are -true- sugar addicts. So, not saying they don't exist, but are a significantly lower number of the population than US religions would have you believe.
In fact, I have experienced the opposite: I do not enjoy any kind of "ugly", much less "extreme" porn. It turns me off.
The simplest kind for me, missionary position, or a girl alone, and that's it.