There is a bit of lewd sex in this story. Naomi wants her daughter-in-law Ruth to get married, so she tells Ruth to sexually seduce a man, which she obediently does.

This is a fictional work of literature with a very important message, so important that it ended up in the Hebrew Cannon of Scripture and later the Old Testament of the Bible. It is a piece of protest literature, protesting the current belief of the Jews that only pure 100% Jews with zero non-jewish ancestors were the chosen ones, and anyone else were specifically the unchosen ones. The Jews at the time were practising racial clensing, exiling anyone who was not a 100% pure Jew. It caused great unhappiness throughout the community as many were sent away due to their racial impurity. (In a similar way, Hitler claimed racial superiority for the Aryans, of which he said the Germans were the highest form. As the master race, they were told, they had the right to dominate all nations they subjected.) Hence an anonymous person wrote the book of Ruth. See Commentary on the book of Jonah for a thorough description.

At the end of this story we find that King David himself was not a full-blooded Jew. His great-grandmother was a Moabite woman named Ruth. David himself would have been purged by the laws under which the Jewish state was then operating.

Other "books of protest" in the Bible are Job and Jonah.

According to Spong[1] the book of Ruth is fiction. The Catholics as of 1995 still claim, "there is every indication that, as tradition has always held, it contains true history." The Catholics have however, at least as of 1970, admitted that the books of Jonah and Job are fiction. See The Book of Jonah and The Book of Job Bibliography:
[1] John Shelby Spong Rescuing the Bible from Fundamentalism : A Bishop Rethinks the Meaning of Scripture
[2] Catholic Bible (1995)
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