Ok. So I've been trying to nail down my argument. And it might not be the best, but this is what I've come up with.
Scenario. Office based job. 1 woman who works there is young, bubbly, pretty etc. The men give her lots of attention which eventually leads to sexual talk, objectifying etc. Another women pulls the men up on it, but the young woman says, no it's ok, I don't mind, I like it. (Consent given)
Eventually this sexualized talk and objectification seeps out towards all/most/other women in the office. They don't like it and a few voice their annoyance/concern.
Typically responses back are - ' you are a prude' 'you are just jealous' 'you must be one of them feminists'
It is inconceivable to a lot of pro porn people that the women who are anti porn may not be jealous, but may just not like the treatment that stems from this minority who like and consent to it.
It is seen as patronising and condescending to think of that woman in the office scenario as having low self esteem issues because she has given her consent and therefore her diabolical treatment at the hands of her male colleagues must be seen as pro choice, and empowering.
In short, I think its the one thing (apart from the fact that we are the only ones who can give birth) that is holding us back from equality and I would go as far as to say that it's making us go backwards.
Hope that makes sense.