In a bit of searching, I found this quote:
Quote:
The adult film, "The Uranus Experiment: Part 2" has been nominated for the Nebula Award, one of science fiction's highest honors. It includes the first explicit sex scene shot in zero gravity. The segment was filmed on an airplane which flew to an altitude of 11,000 feet, then entered a steep dive. The actor and actress had a mere 20 second window in which to complete their erotic scene.
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A quick Google for more information on this research experiment located several torrents. I leave the rest of the research as an exercise to the reader.