The "thoughts" here are certainly valid and worthy of consideration, but some will disagree.
I, for one, will take exception to the idea that there "should be no interaction between the viewer ..."
What specific "interaction" could be in question, I do not know ... but, IMHO, the idea of establishing some *relation* between "figure" and "viewer" through the photographer is of paramount importance.
"Eroticism"? - I remember one painter - Renoir? - who was asked if his work was "erotic". He answered, "If it is not, I have failed miserably".