Even more fun is how the definitions have shifted

"Soft porn" used to mean sex films (etc.) in which you couldn't actually see what's going on, and in which the actors were usually faking everything anyway, with "hardcore porn" being the kind in which you
can see everything. Simple nude shots were soft pornography, as were things like those Tiroler films coming out of Austria in the 1970s.
For example, this would probably have been considered hardcore porn thirty, forty years ago:
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These days it's soft because she's not doing this:
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