'Should every adult that has ever looked at any pornographical material be charged with rape?'

If it can be demonstrated that the subjects of the images were forced into acts against their will through their own powerlessness (be it the result of being children, through poverty or the threat of violence), then yes.

If pornographic images feature children then the assumption must always be that they have been compelled to submit to abuse for the purpose of the production of such images. Therefore the consumer of the image is in every sense as culpable as the producer of the image.

Do you view child pornography, Tim?