Well you guys, as I am not satisfied with any of the answers given here, I have gone to the Stylistics website and contacted an administrator and left the question on their guestbook.
If this term actually means anything, surely the writer or one of the band is the best person / people to ask!
As littleoldme points out, the evolution of language through common usage could mean the term "I'm Stone In Love With You", means something totally different to what we all think.
An example of what I am saying here could be this, quite a few bands did a number called "Back Door Man", In southern culture, the phrase "back-door man" refers to a man having an affair with a married woman, using the back door as an exit before the husband comes home.
From Wikipedia: The phrase "back-door man" dates from the 1920s, but the term became a double entendre in the 1960s, also meaning "one who practices anal intercourse."
If / when I get a reply, I will post it here.