Chaucer and I wrote stories,

Chaucer and I wrote stories,
Bawdy and lewd from the start,
Mine they said were pornographic,
But Chaucer's were classical art.

If a canonised saint of the art world shows a piece of work, we are supposed to say how wonderful it is, how original, how full of meaning. Had an unknown hung the same item on the railings of Hyde Park with a £30 price tag, it could well be ignored.
The point is, many people follow what they are told to believe. If they are told that mere nudity is bad, shameful, sinful or simply unacceptable, (and what about the children?), then that is what they will believe. Sad isn't it?