bz316 said:
This is a doomed plan if the porno involved a man. Low gravity decreases blood pressure and circulation, so its probably not even possible for a man to get an erection in space.
Actually no. Some years back, a space themed pornographic film (entitled "The Uranus Experiment 2" or somesuch) was made that featured a (brief) penis in vagina scene in simulated zero gravity, which you can do with a special plane flying in a parabolic arc, the ones they use to train astronauts because you get lots of Gs followed by freefall.
Not only did the man get an erection in simulated zero gravity, he was able to get one very soon after taking serious Gs. But, yeah, professional porn star and all.
The details of this intrigue me...I'm under the impression that this was too expensive to practice, and with very little time in freefall to film, so the cast would have to endure the G-force, and be ready to go right away afterwards in an environment that they'd have had no experience with. Now, as well as the inevitable problems of various bodily fluids floating around in freefall, apparently throwing up is very common in these planes (the US version is nicknamed the "Vomit Comet"), so could easily have ended up with impromptu vomit porn.
The scene was nominated for a Nebula award (and I can see why), but didn't win (and I can see why).