So I'm reading Song of Solomon (aka Songs, Song of Songs). It is about sex. I'm serious! It can be about two lovers. Or it can be about the relationship between God and His beloved: us. It is both!
"Right in the middle of Holy Scripture comes this disconcerting and paradoxical book," my commentary says. Later, "Only two things come across clearly - that it has to do with love between man and woman, and that it is full of allusions to the spousal Covenant between God and Israel. Everything else (literary genre, theme, argument, etc) is a matter of guess work."
It is somewhat uncomfortable to think about those things together, isn't it? But God did create man and woman in His image, and it would therefore man and woman together would have something to do with God. The Bible is constantly talking about God and His people in a relationship like this. When His people were unfaithful, He called them harlots. They were adulterers.
Jer 3:6 The LORD said to me in the days of King Josiah: "Have you seen what she did, that faithless one, Israel, how she went up on every high hill and under every green tree, and there played the harlot?
Jer 3:7 And I thought, 'After she has done all this she will return to me'; but she did not return, and her false sister Judah saw it.
Jer 3:8 She saw that for all the adulteries of that faithless one, Israel, I had sent her away with a decree of divorce; yet her false sister Judah did not fear, but she too went and played the harlot.
Jer 3:9 Because harlotry was so light to her, she polluted the land, committing adultery with stone and tree.
This should be a very interesting read!