First animals to have sex: What the first penetrative sex looked like (VIDEO).

What the Earliest Act of Intercourse Looked Like (Video)

What the Earliest Act of Intercourse Looked Like (Video)

Slate in motion.
Oct. 21 2014 2:19 PM

The Birth of Sex

Placoderms had intercourse "square-dance style” more than 385 million years ago.

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Research in Nature details what may be the first acts of intercourse that took place some 385 million years ago in Scotland​. They performed the act in a maneuver the researchers called "square-dance style."

Update, Nov. 28, 2016: This video has been removed pending the resolution of a licensing claim.