So in 1999, four couples and three single women were recruited for a study. Once assembled, the participants were instructed to climb into the MRI machine (here known as the metal tube of judgment) and have sex with each other. The single women were tossed inside with a masturbation directive (and a wall calendar of shirtless firemen).
The Perverted Bit:
The experiment began with the couples engaging in "face to face coitus in the superior position" (which is sexless egghead speak for missionary). After the scientists had gotten enough dissected sex photos (dissexted?), they told the males to leave the machine and told the women to keep going by themselves, presumably to capture that extra edge needed for the medical journals.
"Oh, so the same thing we do every night. But with magnets."
The lone women would diddle it up until they reached "the pre-orgasmic stage," at which point they would inform the scientists over an intercom (which while not in use for communication was presumably feeding in an endless stream of R. Kelly songs, such as "My Pony," "Bump and Grind" and "Gotham City"). After some pre-orgasmic images were taken, the women would resume diddling until climax, which the MRI machine would also record.
The researchers were not the kind of people who thought that this situation would make maintaining an erection difficult, and as such "did not foresee" that sex in a sterile metal tube surrounded by a makeshift curtain and a room full of scientists would be a major boner slayer for nearly every male involved. There was only one guy who had no problems, and the scientists chalked this up to his "artistic commitment" to the project; he and his partner were both a) involved in and dedicated to the experiment from day one and b) amateur street acrobats and therefore "trained and used to performing under stress." So if nothing else, we already know that this experiment will answer most unanswered questions in the field of Amateur Street Gymnasts Who Like to Fuck in Metal Tubes.
Truly an underappreciated field of study.