Just as there is no specific polyamorous Lifestyle, there is no official polyamorous opinion on porn, internet or otherwise. Individuals make their own decisions about what is acceptable in their relationships. You can wave the poly flag and use it as an excuse to do lots of things your wife takes issue with, be a total asshole if you want to -- but at what cost to your marriage? Remember, the focus of polyamory is having multiple loving relationships. Sex is a part of loving relationships, but not the only thing, and not the main focus. Always ask yourself if what you're doing is ethical and loving toward the people in your life and you'll know if that is acceptable in poly.
Independent solo polyamorist seeking lover-friends willing to invest in friendship, companionship, and love, but without a need for partnership.
Never confuse commitment with exclusivity, love with ownership, nor sex with intimacy!
For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.
~ Carl Sagan