Speaking of sex in an MRI tube

“Took me a couple of goes, but I see it now. Still euww though. Please can you post some actual porn to take the image out of my mind.”

That’s our favorite comment, from a Guardian reader, about this first-ever MRI video of human sexual organs while those organs were in use. The video was a spin-off of a 2000 Ig Nobel Prize-winning research project. We made it public—with enthusiastic permission from research project leader Pek Van Andel—in 2009.

BONUS: Read the accompanying Guardian column.