First: "Adam and his wife were both naked, and they felt no shame."
Then, later: "Then the eyes of both were opened, and they knew that they were naked. And they sewed fig leaves together and made themselves loincloths."
I don't know, or care to focus on, how literal or figurative the story is. Perhaps it's describing a change that occurred during evolution to (or within) homo sapiens, a change that caused us to be more self-aware (in a bad way?), self-reliant, conscious of good and evil. Just speculation here.