I am also surprised that some people claim to need legislation to make them stop watching porn.
I do understand that it COULD be abuse/rape.
If you know that the women you are watching might not have consented, why watch?
I find it really hard to believe that people who claim to care actually do, when they continue to choose to watch it knowing for a fact that they have no way to verify her consent. How is that caring?
But I DO care and would do all in my power to ensure that it was not.
What do you do then to check? What do you have in your power to ensure that it's not abuse/rape? Nothing. That's the answer I suspect. You do nothing. Sweet FA.
And then you try to justify it instead of admitting, yeah, you do know that they might be being abused/raped but because their is no proof either way, no legislation against it and lots of other people do it, you're going to carry on. And if you get your jollies watching a woman being raped, well hey, what can you do about it? 
Meerka it is heartwarming to see you are now thinking about this with a more open mind and encouraging your dh to think about it too. Once you realise what you/he are really watching or risking watching, it is harder to just ignore it. You/he are more likely to start being disgusted at the abuse of women rather than turned on (hopefully).