WATCH: Nathan Fillion in "Nailing Your Wife"

James Gunn, director of Slither, has just featured Nathan Fillion (Serenity, Slither) in his first PG-rated porn production, "Nailing your Wife."  And, man, is it funny.  Essentially, the idea is to spoof all those awkward moments that lead up to the money shot in porn films.  Bad acting?  Here, it isn't just essential--it's the point.

Real life porn star Aria Giovanni gives a riveting performance.

Check out the short film below.