This is based on hazy memory of a piece in an old photogramphic magazine, late Sixties or early Seventies, and discussing what was coyly described as "glamour" photography; very soft porn, if that. The suggested distinction was whethee the photographer or the model dominated the creation of the picture. Whether the photographer seemed to be recording what the girl was doing, or whether there was a sense of something more. Of course, in those days it was harder to show anything in the UK. Topless models in newspapers were still shocking, and from where I was "Swinging Sixties" was still an ugly rumour about a few hundred people somewhere in semi-mythical London. But the idea had stuck in my mind, and it still seems to suggest something. From what I've seen, pictorial porn still seems to be observation, rather than a creation by the photographer or director.