Seriously, what's the argument for porn being speech and expression? What is the message it's trying to convey?
Edit: Guys, I'm asking if it's speech/expression and, if so, how. Most of the comments in support of it aren't answering the question, just showing their support for free speech and expression, in general. Only one guy has made a case for it, comparing it to car shows and art. And, even though I have reservations about labeling it as art, I appreciate that he's making a case for it and not just side-stepping the issue.
It's like cars. There's your Show car porn, with awesome body work, meticulous and color matched wiring and components, looking like it was assembled by gods of aesthetics. Then there's your beat up 94 Hyundai Accent, that's only good for point A to point B. One is art, the other is a tool.
So I'd say it depends. Some of it is artsy, with subtle hidden meaning or a celebration of the human body, some of it is raw utility, meant only to help sales of tissues and hand lotion.