Whether or not the First and Fourteenth Amendments protect pornographic images, there would be no practical way to enforce a ban on the domestic consumpiton of imported porn without undermining the Fourth.
Further, I fail to see how it is somehow worse for someone to watch a video of a few couples having sex than for the person to pick up a stranger in a bar for a one-night stand. To be sure, neither behavior is conducive to finding a good stable relationship, but I don't think "normal" porn (as opposed to rape porn, child porn, etc.) is the problem.
Perhaps the ability for people to receive sexual experience or sexual stimulation by other means has reduced people's efforts to seek stable relationships, but there are many, many other factors as well. Women's lib has made it much harder to find a good wife, and much riskier to get married. IMHO, the popularity of alternative sexual outlets is a result of that, rather than the cause.
"there would be no practical way to enforce a ban on the domestic consumpiton of imported porn without undermining the Fourth."
You keep making the argument that, since enforcement could not be perfect, we should endorse pornography by making it legal.
That argument has no validity.
We can't stop people from committing any category of crime at all, from cannibalism to mooning. That simply does not constitute grounds to stop trying, or to stop registering our disapproval.
Murder should be illegal, even though there's no way to enforce a ban short of immobilizing everyone alive. Pornography should be illegal, even though there will still be some around. At least those who buy it will understand that they are doing a bad thing.
"Further, I fail to see how it is somehow worse for someone to watch a video of a few couples having sex than for the person to pick up a stranger in a bar for a one-night stand."
It is worse, as a general thing, but before I explain why, let me ask what that comparison has to do with anything? Some crimes are worse than others, but that doesn't mean we should legalize the lesser crimes.
It is worse to watch the video because the people in the video are engaged in prostitution, and when you watch, you become the person paying them to degrade themselves (and put their immortal souls in deadly peril). Futher, they are often being exploited and even extorted into performing.
"I don't think "normal" porn (as opposed to rape porn, child porn, etc.) is the problem."
Nothing is "the" problem. Some things are "a" problem, or a part of a problem, and pornography is certainly an element in our social problems today.
"but there are many, many other factors as well."
That doesn't mean we should endorse any of those elements. We should oppose them all.
"Women's lib has made it much harder to find a good wife, and much riskier to get married."
Too true, too true.
"IMHO, the popularity of alternative sexual outlets is a result of that, rather than the cause."
As with so many things, once the cycle gets running, it is both cause and result, feeding upon itself.