It seems there is a conflict between the man you know your husband to be (kind, loyal, respectful etc) and the behaviour (looking at porn, which you associate with misogyny and exploitation).
It can be difficult to reconcile two such seemingly opposed things.
Porn may be a black-and-white moral issue for you, but your husband isn't. We are all shades of grey (no pun intended), good thoughts mixed with bad, with quite overwhelming urges at play sometimes, however strong our morals, however good our intentions. Your husband has caved in a couple of times to his urges. He hasn't gone out and raped / killed anyone .... but he has caved into a natural urge, the act of which may or may not have involved the exploitation of somebody somewhere along the way, and which involves the viewing of material that is generally representative of misygynistic views (but not necessarily representative of his own views).
In your view (I assume, although I don't have time right now to look back over all your previous posts for your exact feelings about porn), people who watch porn are misogynists. Do you really think your husband is, though? From what you've said of his character, I don't think you do think that.
But I can see you're in this conflict - "I know people who watch porn are bad, but my husband's not bad... is he?" How do you reconcile this in your mind? It's like the rules have been broken somehow.
If everything you know about him after all this time, combined with your instincts, are telling you that he is a good man, honest to the core (apart from the two times he's lied to you about porn) then I think that should come into play in your decision making about your future, t'is all.
I don't think you think he is a liar in any other area of your lives together. If you do think this, you need to examine the lying behaviour, before the porn watching behaviour.