Asexual people can and do still use porn for sexual gratification. Just like how some Asexual people still have sex.
Hm, does that argument ring hollow to you? Maybe because you were trying to make a point about the group and not every individual in it?
I'm speaking from my own experience which has been that in 6/6 cases when I've learned that someone was a furry the conversation quickly turned towards the topic of furry porn, which I did not want to discuss.