You can't tell someone who speaks from experience that he is delusional. That's just a non-starter.
my question is: why can't you become excited looking at pictures of your own spouse?
Because she refuses to pose for me. Perhaps you can recommend a stratagem?
Why is it that your spouse is not enough to get you excited?
The flaw in your argument is that, for some people, their spouse just isn't enough. It's all well and good to say, "then just make do" or "that means there's something wrong with you", but putting aside the porn will not cure that. At least with the porn, they share some intimacy. Do you really think that by closing that off, they're going to improve their relationship?
Personally, I have rather the opposite problem: my spouse's main objection to porn is that I already pester her too much without the additional stimulation.
I have a little too much to drink now and then, but I would never hold up that behavior as helathy or virtuous.
One or two drinks per day really is optimal for health. All things in moderation.
If you're not careful, you'll start out watching two people making love on a picnic blanket out in a meadow, and a few months later you'll be satisfied by nothing less than a six-way orgy involving major appliances, both electric and gas-powered, barn animals, and a bull-whip.
Now you're delusional. Oh, er, wait...nevermind.