One thing I have learned through many tears is the differing levels of obedience. If a person is addicted to pornography, what difference does it make if they are watching some unacceptable PG-13 movies? That is like worrying about a small knife cut while there is a spear lodged in their chest. A member of my ward admitted once that while he was fighting the addition to porn, he saw how many PG-13 movies put the seed of desire back into his heart. Thus he was ready to stop watching them. I may watch that same PG-13 movie and truly be unaffected. But I have yet to see an R-rated movie which does not contain something I find objectionable.