DrNortherner and others, yes men will always "behave badly" and perhaps many will even seek out nude pictures and video of women. However how these activities are viewed wiithin a society can vary massively, from being outlawed to being seen as totally normal and no real harm to anyone within the society.
I take the view that the widespread images of women in sexual poses and situations do harm society, both its most vulnerable members - children - and women in general.
The net result is that girls and women are seen as more sexually available than they actually are, and socially pressured to be so. Their non-appearance based qualities and accomplishments are also potentially given less recognition.
And while you might always have pervy truck drivers, it should be made clear to them that their comments are unwelcome and unacceptable. In some places (not in the UK in my experience at least), you can't walk down the street without several comments on your appearance and invitations to perform sexual acts. Is that what we want to happen here? It is very distressing, particularly for young girls.
Society needs to set boundaries.