Earthworms are hermaphroditic and they do a “69” thing when they mate (see diagram here.)
When I learned this fact in school, the professor said the mating process lasted “all night”, but I’ve been unable to find a cite for this.
Earthworms can live to be up to 15 years old. If you chop one in half, it usually dies, contrary to popular belief. Cite.
Oh, what the heck, I just have to quote this: