Assuming gallerypost just did the spam shit, that's about as blackhat as you can get, and google will slap the balls out of him sooner or later for it. No one needs to report it, it's a legit, albeit dirty tactic, to gain good rankings. And he will most likely go down for it, so let it happen naturally is my opinion.
If he's getting 90k hits a day for the keyword "porn" and doesn't know how to convert it, then he has the blackhat down, but not the "selling porn" side, so who cares
He'll be gone from the first page soon enough as it is.