Oldest Sex Act 385,000,000 Years Ago

The first sex on Earth looked like square dancing — if fish could square dance, of course.

That is the finding of a new study of 385-million-year-old fossils that reveal that the oldest jawed fish on Earth were the first to reproduce by copulation. Later fish would revert to spawning — releasing eggs and sperm into the water to meet — but some have since re-evolved the ability to have coupled-up sex.

The oldest known sex act took place when tiny fish called Microbrachius hooked their jointed arms side by side and linked bony genital claspers with bony genital plates to transfer sperm from male to female.

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