For some reason, I always thought that was a cover by her of an old Motown number. Turns out, I was only half-right, old yes, Motown no:
As for wet dream instigation (or inspiration?), I was always more on Carly's (Simon) team. Speaking of her, I found the Ronstadt track to be an echo to Carly's previous You're So Vain, both musically and lyrically, but given how You're No Good is the older number in its original form, it might have been the other way around!