I recently read this article here: archive.salvationhistory.com/library/scripture/JBL%20Gen9.pdf
It’s an essay by Scott Hahn on the nature of Ham’s sin when he sees Noah’s nakedness.
There are some interesting things that he discusses there, which I wonder may also pertain to the story of Adam and Eve.
Firstly, Scott Hahn says the following on pages 30-31:
“For example, several narrative critics have suggested that Gen 9:20–27 is chiastically linked to Gen 6:1–4, the story of the intercourse of the “sons of God” with the “daughters of men.”24 One story introduces the flood narrative, and the other concludes it; Gen 5:32 continues in Gen 9:28–29, forming an inclusio around the two stories.25 When Gen 9:22 is understood as paternal incest, it becomes clear that the two stories are united by the theme of illicit sexual intercourse as well.”
I would suggest that this inclusio is a subset of a wider incusio beginning at Genesis 2:4 and ending at Genesis 9:29. There are several themes that run throughout this entire set of chapters including: the creation of man (Adam and Eve) and the recreation of man (Noah), man as farmer (Adam created to till the earth, Adam cursed after the fall to labour in tilling the earth, Cain as a wicked husbandman, Noah as a righteous husbandman), obedience (disobedience of Adam, the obedience of Noah), among others.
Notably, in Genesis 2:5-6, we see the introduction to the flood story when it says, " And every plant of the field before it sprung up in the earth, and every herb of the ground before it grew:** for the Lord God had not rained upon the earth**; and there was not a man to till the earth. ** But a spring rose out of the earth, watering all the surface of the earth.** Then, in Genesis 7:11-12, we see this:  In the six hundredth year of the life of Noe, in the second month, in the seventeenth day of the month, **all the fountains of the great deep were broken up, and the flood gates of heaven were opened:  And the rain fell upon the earth forty days and forty nights. **
So, between Genesis chapters 2 and 7, we have this narrative link showing that the Flood rains were the first on earth, prior to which there was a spring that came out of the earth to water it. I might discuss the symbolism of water as a source of life, and it’s ties to baptism, and how the flood is a presage to baptism, cleansing the world. Moreover, the symbolism of arising from the earth versus being rained down by God (Gen 2:5 “God had not rained upon the earth”) is a symbol of the life of man arising from within (inner-communion with God) pre-fall, versus the life of man arising from without (external communion with God through obedience to the Law) post-fall.
However, my point is simply to demonstrate this pericope, this thematic link that stretches between Gen 2 and Gen 9. My reason for doing it is this: I would like to draw a further thematic link between Ham’s seeing the nakedness of his father, and Adam and Eve’s seeing their own nakedness when they sin.
Scott Hahn builds his argument that Ham’s seeing his father’s nakedness is an idiomatic expression that suggests he engaged in maternal incest based on the idea that to see one’s nakedness is the same as to uncover one’s nakedness. On page 29 of the link above, he states:
Indeed, it so happens that the phrase used to describe Ham’s transgression—“to see the nakedness of the father” (ba twr har)—is an idiom for sexual intercourse.15 Leviticus 20:17 equates the idioms “to see nakedness” (hwr har) and “to uncover nakedness”
awh dsj wtwr[Ata hart ayhw htwr[Ata harw . . . wtja ta jqy r
hlg wtja twr[ . . .
If a man takes his sister . . . and sees her nakedness, and she sees his nakedness,
it is a disgrace, . . . he has uncovered his sister’s nakedness.16
In Genesis 3:7, we have the following: “ And the eyes of them both were opened: and when they perceived themselves to be naked, they sewed together fig leaves, and made themselves aprons.”
Here, we have both an “uncovering” (their eyes were opened) and a “seeing” of their nakedness, and this seeing is tied specifically to shame, which is why they covered themselves. Admittedly, I am not a Hebrew scholar, and don’t know if the words used here are similar to those used in Leviticus or even the Noah story to describe the seeing of their nakedness, and I would certainly like whatever feedback anyone so schooled could provide, but based on the translation I have, and the thematic links in these chapters, I would suggest that this passage intends to put accross that the nature of Adam and Eve’s sin, their disobedience, was of a sexual nature, and perhaps even, as with the later story, incestuous.