Scientists are performing some pretty hard science these days, so of course a GIF of a couple having intercourse inside an MRI machine is going viral on Reddit.

And why not? According to researchers, a healthy sex life can lower one’s blood pressure, boost the immune system, and reduce heart attack risk.

Still, scientists are intrigued exactly how the “birds and bees” work, so they’ve turned to MRI scans and 4D ultrasounds to image couples having sex.

The first video is a couple having intercourse inside a magnetic resonance imaging (MRI) machine.

To watch a couple have sex in 4D ultrasound, check out this video with author Mary Roach, who recounts the tale of how she wound up having sex for science.