You're mincing words a bit and then building an argument based on a false equivalency. Pornography is not the same as whoring, and it's not equivalent to lust either. It means a graphic depiction intended to sexually arouse.
I could almost give you the legal definition from memory. I was on a federal grand jury for over a year, and we heard a bunch of child pornography cases. Every single time they'd read us the definition of what pornography was, because defining terms is a necessary part of debate and right judgment.
I don't think so. And if you were brought up in the church at all, or in a strict home, "porn" is actually a pretty bad word, I'd say worse than "whoring" which we just don't use that much today. Maybe that's your point, to bring it back into common parlance for effect? Ok, but it's just a word. The underlying issues are still the same, the instincts and hormones of men are not going to be different just because you use a different word. I predict zero men would "suddenly realize" anything just because the vocab changes. They already realize what they are doing is wrong.
In terms of consequences, I'd say the latter is more egregious. If David had lusted over Bathsheba but not sought her out, things might have gone differently. "And if all of this had been too little, I would have given you even more".
But the root issue is that we act without regard to God's will for us - knowing that he has our best interests in mind, but taking matters into our own hands to get what we want.
If banning prostitution worked, you wouldn't have to use a qualifier like "normal" to describe it

But that's another conversation.