Can I be a mitigator between you guys ? Computers in the 80s were used for playing games, making music and also the UK in some ways started a whole revolution in (starting with the ZX line of computers) of "bedroom" programmers. When it came to the year of 1982, the C64 came about, then another revolution was rolling, there music, programming and in small ways a bit porn(ish) came with the games such as Strip Poker, to mention just one title, or another one on the C64 Sexgames. (yes I am aware that the Atari 2600 had some seriously messed up XXX games). Then in 1987, came the Amiga 500(yes I am aware that the Amiga 1000 came out in 1985 And so did the Atari ST). But what I am getting at is this. The first digital porn movie, was probably one that came out on VCD, which is actually an old format. And I must agree with Caluser2000, porn on computers has been around for longer than just a digital pornographic movie in VCD format.
But during the 80s and 90s computers were used for "bedroom" programming, entertainment. games, music creation, from anything from mod files (tracker format) to midi (on the Atari ST), heck if we take the whole C64 "scene" of demos and what not, there was a ton of music in SID files, demos as in graphical demonstrations to , you name it. Hell some brilliant C64 games musicians are even famous today, thanks to the SID chip. Chris Hülsbeck, Rob Hubbard and Ben Daglish to mention three. And yes I am aware of other micros of the time, other than those I have mentioned.