Simstim from Neuromancer (released in 1984) is the first mention of such a thing that I know of.
Brainstorm (1983) did it before Neuromancer. The movie is about a device that records and replays sensory and emotional experiences, and a central plot point is that it records the dying moments of a character.
I thought the central point was the porn played on a loop. Maybe I was distracted and missed the real plot. Also maybe mixed up by the fact that one of the principle actors died in real life while the movie was being made.
The porn thing showed that the device could be harmful to the viewer. This adds another dimension of risk to the later scenes where the Walker character is experiencing the death tape.
The actor was Natalie Wood, and the event is shrouded in mystery about how she died. However, the character who dies in the movie is played by Louise Fletcher.
The central point was like Lawnmower Man, the military / government were going to misuse the tech for evil purposes.
The porn and the vicarious near-death-experience were just plot points.
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