The big problem with pornography is defining it. You can't just
say it's pictures of people naked. For example, you have these
primitive African tribes that exist by chasing the wildebeest on foot,
and they have to go around largely naked, because, as the old tribal
saying goes: "N'wam k'honi soit qui mali," which means, "If you think
you can catch a wildebeest in this climate and wear clothes at the same
time, then I have some beach front property in the desert region of
Northern Mali that you may be interested in."
So it's not considered pornographic when National Geographic
publishes color photographs of these people hunting the wildebeest
naked, or pounding one rock onto another rock for some primitive reason
naked, or whatever. But if National Geographic were to publish an
article entitled "The Girls of the California Junior College System
Hunt the Wildebeest Naked," some people would call it pornography. But
others would not. And still others, such as the Spectacularly Rev.
Jerry Falwell, would get upset about seeing the wildebeest naked.
-- Dave Barry, "Pornography"