250 million years ago the armour-plated Placoderm fish invented the act of sex as we know it. Hubba Hubba. Dive into the historical sack as we go in search of the origins of nature’s greatest-ever invention.

Dallas’s guest on this episode is Australian palaeontologist John Long, author of The Dawn of the Deed.

Produced by Freddy Chick. The senior producer is Charlotte Long.

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