If something exists, then, yes, there is a dirty movie of it. Video games and anime exist, so, yes, there are dirty movies of them. Japan just seems to have more of them.
Sure, the West has its own video game porn parodies. Blue movie versions of World of Warcraft, Left 4 Dead, and Tomb Raider come to mind. There are even phony porn parodies, like these images created by artist Porrskada. Japan, however, is working on unleashing enough video game and anime inspired porn to last the humanity until the end of time.
Japanese adult video maker TMA specializes in otaku inspired blue movies. Since 2001, TMA has released cosplay themed adult flicks aimed at Japanese geeks; starting around 2005, however, the company really started pumping them out, resulting in movies featuring actress dressed in array of game and anime outfits.
While TMA is perhaps the most well known in Japan, it is not alone, and there are other companies that release these sorts of productions. Erotic cosplayers also release their own adult photos and flicks.
The above gallery features a smattering of box covers from over the years, including the Brain Age parody, which isn't actually from TMA, but rather, another company. The images *should* be safe-for-work; however, the titles might not be.
(Top photo: TMA)
Dick Disciplining Adults' Stimulation Dirty Talk Training is a Brain Age parody. More info here.
Viewer's Selection Magical Young Girl Cosplay Magical Magica Return is a parody of Puella Magi Madoka Magica
Disgracful Heroine Sailor Sentai is a parody of Sailor Moon.
Perofella is a parody of Persona. More info here.
Only a Ponytailed Diva Doesn't Want to Watch! 4 Hours is four hours of Hatsune Miku cosplay. And other things.
Cos-Play Magical Girls features various magical girls and this English tagline: "Fuck Magical Girls!" Ahem.
In Layers Cute Hard: Yuuna, cosplayer (or "layer" in Japanese slang) Yuuna dresses as Morrigan from Darkstalkers.
Boy's Love Cosplay: Atsuto Okada features Tiger & Bunny cosplay and dudes having sex. More info here.
Adult actress Miho Imamura parodies K-On! in this flick.
Cosplayer Yua Kisaki does a hardcore Macross Frontier send-up.
Only Fighting Girls Don't Want to Watch! 4 Hours is four fours of fighting girls doing way more than fighting.
Cosplay Hyper Best is a best-of flick.
The Meloncholy of Hahiru Suzumiya is a parody of anime The Melancholy of Haruhi Suzumiya.
Once Again, The Melancholy and Disappearance of Hahiru Suzumiya is, once again, a parody of Haruhi Suzumiya.
Keionbu! is a parody of K-On!
Yuricosu! Cosplay bills itself as a "Lesbian's Laybryinth".
Cosplay Festival features outfits from bullet hell shooter Touhou Project. Like Touhou Project, this flick has a variety of projectiles.
Cosplayer Frontier is a Macross cosplay parody.
DIGITAL REMOSAIC Cosplay International features "international" porn stars dressed as Ulala from Space Channel 5 and Morrigan from Darkstalkers.
DIGITAL REMOSAIC Cosplay Kyoko Ayana features Kyoko Ayana as Chun-Li—complete with new mosaics!
Code Eros: The Tyranny of Cosplayers is a Code Geass parody. Boy, "Geass" lends itself to all sorts of porno titles.
Porn star Tsubomi does her best K-On!.
Cosplay: Nao Oikawa features these English taglines: "Is it true that if you play with yourself, it's good for your skin?" and "Shove to the hilt!"
Cosplay Musou is a parody of Tecmo's Musou slash-and-hack games.
Kira Suta (Twinkle Star) is a parody of anime Lucky Star.
Faith stay Knight is a parody of PC game Fate/stay night.
READY TO RUMBLE (not my caps, theirs) is a parody of Konami fighting game Rumble Roses.
Cosplay Rin Nohara features pornstar Rin Nohara dressed as Yuna from Final Fantasy X.
The Complete Words of Tsubomi's Costume Play features a variety of cosplay, including the inevitable cosplay of Konami's love simulator Love Plus.