The last four years has been the Golden Age of superhero porn parody. Pornographers have methodically worked their way through the DC and Marvel canon, and every Hollywood superhero blockbuster has spawned at least one XXX knockoff.

The genre goes back a long way, of course. Charlie Jane Anders traced “the Bizarre History of Superhero Porn” at io9 a couple years ago, starting with Tijuana bibles from the 1940s featuring Superman and Plasticman. She also included kinky underground comics from later decades.

The first superhero porn parody feature film appears to be Bat Pussy (1973).

Bat Pussy is an incredibly strange film. It has achieved cult status as “the worst adult movie of all time” among ironic bad cinema aficionados, renowned for its technical ineptness and anti-eroticism. You can read appreciations at AV Maniacs, Movies About Girls, Radiation-Scarred Reviews, Vault of Buncheness and more AV Maniacs. If you enjoy watching bizarro “how did this ever get made?” terrible movies, you’ll enjoy Bat Pussy. Otherwise, it’s really just terrible.

The film opens with a long scene of Buddy and Sam getting busy in a dingy cabin set. Even by the looser standards of 1970s porn, Buddy and Sam are physically unappealing specimens. Ratcheting down the eroticism further, they spend most of their time bickering and trading insults. Something Weird’s blurb captures the vibe: “When their mouths aren’t busy chewing on the lower portion of each other’s anatomy, they are babbling away at one another like two escaped mental patients. … Snappy lines include: ‘You wouldn’t know how to eat someone if you were doing your grandmother’ and ‘My horoscope says I’m gonna fuck you in the nose.'”

Eventually we cut to “Bat Pussy Headquarters”, where Dora senses a crime being committed, changes into her Bat Pussy costume, then travels across Gotham City on a rubber Hoppity Hop ball.

Bat Pussy finds Buddy and Sam in bed with a camera and accuses the couple of shooting an illegal porno flick. Then Bat Pussy abandons crimefighting, strips naked and joins Buddy and Sam for a threesome.

And that’s pretty much it.

The identities of the filmmakers and stars remain a mystery. Surviving prints have no credits. The actors all sport thick deep South accents, providing the only real clue as to where it was made. Something Weird Video salvaged Bat Pussy and released it on VHS, then DVD, now download.

There might have been earlier superhero smut on film. We can’t reliably call anything the “first” this or that, since so much porn and sexploitation was disposable and undocumented. But as far as we know, the genre began with Bat Pussy.