“We suggest that the term 'indecent’ be qualified as follows: – A photograph or film shall not for this purpose be considered indecent (a) by reason only that the model is in a state of undress (whether complete or partial); (b) unless it is proved or is to be inferred from the photograph or film that the making of the photograph or film might reasonably be expected to have caused the model physical harm or pronounced psychological or emotional disorder.”