Why Is NAKED ART Okay, but REAL NAKED Isn't?

So, I was once watching a movie, rated PG, and through out a lot of the movie there were naked pictures (that looked very realistic) of naked men and women. Funny and weird, I know,
but how come naked art is totally okay but a real naked person isn't in a movie? Usually PG-13 is the rating for nudity, but these paintings didn't count for it, I guess. Why?

I mean, it was kinda funny, all these parents taking their little kids out of the theater...
Why Is NAKED ART Okay, but REAL NAKED Isnt?
Of course, the paintings in the movie were way more "graphic" & realistic, but I don't know what G@G would allow me to put, but you get the point.
Why Is NAKED ART Okay, but REAL NAKED Isn't?
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