Ida Sabelis and her boyfriend Jupp had sexual intercourse in an MRI machine in the name of science back in 1991.
Dutch scientist Menko Victor 'Pek' van Andel ( who was friend of Ida and Jupp ) wanted to find out what happens inside the bodies when we have sex and the images generated were the first of their kind. According to the experiment, which featured in a British Medical Journal 1999 entry, they concluded that 'taking magnetic resonance images of the male and female genitals during coitus is feasible and contributes to understanding of anatomy'.
While their lovemaking session happened over 34 years ago, Ida recently gave an insightful interview on the " What Was It Like " podcast, revealing she had no idea it would lead to a remarkable discovery about women's bodies.
Ida, a professor of organisational anthropology at Amsterdam's Vrije University, said initially the plan was to get the images while in the missionary position, but explained due to the size of the machine it was impossible.
"Jupp and I wriggled into that machine and started doing our thing, It wasn't romantic, it was more like an act of love and a performance. Thankfully we didn't get claustrophobic."
It had been a long-running belief that a man's penis went in straight and came straight out, with early depictions including the famous Leonardo da Vinci drawing from the 1492 showing the vagina as a straight cylinder.
But the MRI showed "the penis was the shape of a boomerang", meaning it bends inside to the shape of the woman's body, without any pain to the man during his erection.
The discovery was huge, leading to a formal study conducted between 1991 and 1999 by Ida and Pek, the results of which were published in the BMJ.
These subsequent experiments were all done in the missionary position, using volunteers above the age of 18 who could quit at any moment.
No one did, but Ida pointed out no one other than her and Jupp were able to complete the test without using Viagra.
Despite the fact it was published on December 24, 1999, the paper was one of the medical journal's "most popular articles of all time" and was even honoured by BMJ on its 20th anniversary in 2019.
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