Ezekiel 23

25 I shall direct my jealousy against you; they will treat you with fury; they will cut off your nose and ears, and what is left of your family will fall by the sword; they will seize your sons and daughters, and what is left will be burnt.

37 They have been adulteresses, their hands are dripping with blood, they have committed adultery with their foul idols. As for the children they had borne me, they have offered them as burnt sacrifices to feed them.

In this chapter, God is comparing the behavior of Israelites with a who*e. Our God YAHWEH is a jealous God, who abhors the worship of other gods. For God, worshiping other gods is equivalent to whoring.

You shall have no other gods before me. (Exodus 20:3, NIV)

While Israelites were in Egypt they worshiped the Egyptian Gods. Even after God rescued them from the slavery of Egypt, they still worshiped the Cow idol at mount Sinai. After conquering Canaan, they again worshiped the Canaanite gods and goddess. God was getting disgusted with their behavior and compared them to who*es. God punished them for their adulterous behavior and let the Assyrians and Babylonians capture them to slavery.

I don't think there is nothing much to say about this chapter other than this simple explanation.

Mawia did an excellent job of explaining the meaning of the passage. Let me address the issue of 'adult language'.

The Bible wasn't written for children. There is absolutely no reason to expect that everything in it should be 'family friendly'. If God wants to talk about people's sexual behaviour, then he is going to have to talk about sex, and there's not much point in dressing it up in 'birds and bees' type euphemisms.

You should also note that the idea that talking about sex, adultery, whoring and related matters is 'unseemly' and that genteel people should feel uncomfortable doing it, is only a hundred or so years old. Read sermons or political speeches from 200 years ago and you will find sexual matters freely talked about without anyone being 'uncomfortable'.

Finally, when you say "you don't read such words usually in a holy book", which holy books are you referring to? There aren't that many holy books in the world, and most of them talk about sex.

Marriage is a Metaphor for/Illustration of Christianity/Judaism/Religion

In numerous places in the Bible, you will see a marital relationship (something we can understand—at least a little) used as a metaphor for or illustration of (genuine) religion, that is, a relationship with God.

In the New Testament, Paul talks like this in Ephesians 5:22-33, when he says

Ephesians 5:25 (NASB)
Husbands, love your wives, just as Christ also loved the church and gave Himself up for her

In the latter part of Revelation, the marriage of Christ to his bride (the church) is revealed as the the inevitable future.

Throughout the Old Testament, the Jews' (individual and corporate) relationship with Yahweh is spoken of as the relationship of a wife to her husband. Idolatry is metaphorically called "harlotry" and "adultery" throughout the prophets (e.g. Hosea, Isaiah 23, Jeremiah 3, Micah 1, Nahum 3, 1 Chr 5:25, 2 Chr 21:11-13, etc.).

This passage in Ezekiel 23 is not essentially different from the other places in the Old Testament where Israel's idolatry is condemned, except, perhaps in the graphic nature in which the behavior and its consequences are described. I don't know if the Roman Catholic church has an official position on the question you've asked, but the purpose of the graphic nature of this passage might be to shock us with its unsettling and gruesome character as if to convey the idea that when we make anything but God the top priority in our lives, we are doing just as horrible and awful a thing as is described of these two metaphorical women.