I am pretty sure Porn as an advantage in one aspect. People went out of their way to seek it. In a aroused state, it wouldn't matter what you're watching, it could be someone just running a hand over their other hand and you'll get viewers, it's just enough to get off on.
Ah, but these days, as a porn site you've got to compete with thousands of others. It's not "will the audience look for porn", it's "Why will they choose your porn over someone else's?" (Likewise, it's not "Will the audience look for an action-adventure show", it's "Why should the audience choose YOUR action-adventure show?")
Most successful porn sites cater to a specific fetish, instead of a bucket of random porn.
He needs to find his target market. Not sure who it should be, though.