Huge majority of women and girls (yep under age) are trafficked and forced to do porn
It is not anything like a 'huge majority' at all. Statistically, it's pretty rare in pornography, not least because putting trafficked women on camera creates an evidence trail for prosecution and makes them much more easily traceable.
And on a mainstream TV porn channel it will almost certainly be zero. They will be professional, consenting performers.
Obviously even one person being trafficked and coerced into doing anything is too many, but you are a lot more likely to encounter someone who has been trafficked, coerced or exploited working in a nail bar, at a car wash, in fast food kitchens, working as a cleaner, or working in the garment, agricultural or construction trades than you are in mainstream pornography.
Of course it's perfectly reasonable to disagree with the existence of porn for all sorts of reasons, but I see the 'the majority of porn is full of trafficked teenage girls' line on Mumsnet a lot, and it's a long way from being correct. I think in a lot of cases, people say that because they don't (for some reason - I don't know why) simply want to say either a) that they don't want their husband looking at video clips of other women or b) they don't think anyone should be able to make a living from providing a sexual service.
Anyway - OP, you can leave your husband for any reason you like. Personally, I think watching porn while you're out of the house is the least of your problems, especially if you have a low libido - to me, the other things you've mentioned are much more significant. But if the porn is a dealbreaker for you and not something you can tolerate, you're entitled to leave him over that alone.
I'm assuming you had previously made your feelings clear about porn, and that he knew it was one of your dealbreakers?