Simply put, I don't see much appeal in the idea of porn movies being made around video games and MMORPGs. But then again while I own "adult entertainment material" I'm not a huge adult film fan. I own a couple, some hentai movies, some adult comic books, etc.. most nerds do.
HOWEVER, I am a believer that sex can, and should be, mixed more into games (as I have said before). I do not personally believe that something has to be all sex all the time, or skirt around the subject. One of the reasons why I am not into "porn" movies more is because ironically they tend to get boring and repetitive, I tend to feel such things work best either in doses or when mixed in with something else.
If I was producing and developing games, and looking to make titles for an adult audience, I might very well hire professional adult actresses who are used to positioning themselves for a camera to perform the scenes and/or model for the animations when such things come up. Say creating actual sex scenes for the bits where you have sex in say Dragon Age or Mass Effect.
Then again, going by the (apparent) success of the video game Burlesque show which was covered here on The Escapist a while ago, I suppose my opinion is probably in the minority. Especially seeing as we see few people lobbying to break the current trend where general entertainment and sex/adult entertainment are seperated from each other by a barrier making the mine field seperating Korea into halves seem minor in comparison.