Not even camcorders. Early porn was recorded on 8mm film that had no sound, so the music was later dubbed in. When it was understood that people wanted to hear voices/sounds they dubbed them in post filming: the guys would be watching the movie and simulating the sounds and more often than not they never quite synced. Of course this was before the major studios got in on the action and actually advertised that their films had real sound. That wasn't necessarily a great thing because it led to guys like Jeff Stryker saying over and over again, "You like that big cock, don't you."