The dude who wrote the book is Ryan Simkin -- who began shooting naked, drunk chicks for Joe back in 2002.
In his lawsuit, Francis claims Simkin -- like all of his employees -- was required to sign a non-disclosure agreement, which strictly prohibited him from "writing and publishing any tell-all books about their work."
So, according to the docs, when Francis heard that Simkin had a book on the way -- he wrote up a little something of his own ... a breach of contract lawsuit.
Francis is also suing the publisher -- it's unclear how much cash Joe is hoping to collect.
