Beside the fact that this story in John's gospel is not found in the earliest manuscripts, it's still a good one.
It highlights the hypocrisy and the judgmentalism that arises out of it.
I mean, one of the most serious and shameful convictions in those days would have been adultery... especially for a woman.
The valid question is "Where's the man?" He's just as guilty.
The other valid question is, "Does religion's obsession with sexual sin betray a fascination with sex itself?"