This is a duet with Elvis Costello, who plays the part of a drunken degenerate felon, while Williams is his long-suffering mistress. Costello was also a last minute addition on the guitar for the Blessed album.
Williams revisited the bad boy from this song in her 2011 cut "Buttercup."
Even before its official release, Paste included this song at #5 in the top ten Country/Rock duets of all time. The Johnny Cash and Joe Strummer duet "Redemption Song" came out on top.