You should have a frank conversation with her and express your desire to view pornography without her being upset.
It's understandable for people to say, "I don't want to watch it", but telling an SO that they can't watch it at all, no questions, is simply a measure of their insecurity. If you were addicted to it and it endangered your relationship, that'd be one thing, but you're just looking to resolve some pent-up baby batter.
Think of it this way: If she were a staunch vegan, Satan worshiper, or even republican (just a joke), and demanded that you not only pay heed to her particular philosophies, but also adopt them yourself without question, would you stand for it?
I think you
would not, and you definitely
should not. You should, instead, have a conversation with her and see what the real issue is.
Because until then, your lying is still lying, and your reasons for lying don't really exonerate you.
