In “Nailing Your Wife,” the first episode of “PG Porn,” a new Web series for Spike TV, actor Nathan Fillion plays Chris, a construction worker who gets a surprise visit from his boss’ wife, Mrs. Grimes, played by the adult actress Aria Giovanni.

“Is Norman here?” inquires Mrs. Grimes, referring to her husband.

“Do you mean Norman Grimes, the foreman of this construction site?” replies Chris dumbly.

It’s the first line of a truly bravura performance by Fillion, perhaps one of the best in the history of the porn satire genre.

“Mmm-hmm,” Mrs. Grimes answers.

Having established that Grimes is not on-site, Chris and Mrs. Grimes cut right to the chase. Director James Gunn bedazzles the short episodes with static and amateur-looking titling, in a successful attempt to send up ’80s-era VHS porn, of which he is obviously a dedicated student.

Porn is a tough thing to parody, because, well, how do you parody it without graphic sex? Apparently that’s the question at which this show is taking direct aim. So far, it seems like it might work.

The money shot in this first episode is a bit of a shock. I won’t give it away, but suffice to say that Mrs. Grimes and Chris were just not meant to be.

Gunn (“Slither,” “Dawn of the Dead”) has five more episodes in the hopper, each of them featuring famous adult actresses, and some of them well-known actors. In an upcoming episode of “PG Porn,” Michael Rosenbaum of “Smallville” plays Charlie Brown to the Lucy of pornstress Beladonna — the episode is entitled “Peanus.” Ha.

The shows will be airing over the next few weeks.