Historically, due to ever changing public tolerances and appetites, the definition of pornography has been hard to pin down, but Supreme Court Justice Potter Stewart summed it for many people when he famously said of porn, "I know it when I see it"
Your Honor, I respectfully disagree.
I've looked at a fair number of web pages in the last couple days for my latest work assignment, attempting to tag each one as porn or not. Sometimes it's pretty obvious. That page called MothersInSperm? Yeah, it's pretty much what it sounds like.
What about this page though? (the link is safe for work)
I'll describe it for those of you too scared to click on the link. It's a fictional story, written by a fan of the original Star Trek, and it centers around a romance between Captain Kirk and Mr. Spock. There are no pictures, it's just gay Star Trek fan fiction.
Is that porn? I wasn't sure. I had to read a bunch of it to find out! It seemed like pretty generic romance novel stuff (assuming that the type of romance novels you read feature Starfleet's finest), but then the clothes came off and suddenly Kirk and Spock's genitalia were prominently featured.
There was only one way to figure this out. I sent an instant message to my wife:
Me: gay Star Trek fan fiction featuring Kirk and Spock: Porn or not?
Hank: DO NOT involve me in your new hobby.
Hank: Wrong number! Crack call! Crank Call!!
No help! I was forced to fall back on the classic metrics and I counted up the number of times I found the word "scrotum" in the story: Twice.
I marked it as porn. Best job ever.