Not dumb, not dumb, not dumb at all.
It is same as pornography. I will know it when I see it.
It is just too complex to describe its actions in words; but it is so easy to recognize it to make a decison. It is pornograhic!
Pornography - You'll Know It When You See It
In 1964, Supreme Court Justice Potter Stewart, issued the following opinion in Jacobellis v. Ohio, one of the early challenges of pornography to the First Amendment of the Constitution:
"I shall not today attempt further to define the kinds of material I understand to be embraced within that shorthand description; and perhaps I could never succeed in intelligibly doing so. But I know it when I see it, and the motion picture involved in this case is not that."