Yeah, you have to be careful in attributing major change to a single track or even an entire album, as often the songs were first played many years prior to their release. I don't really think the stones ever thought lets include demonic songs or let's not include demonic songs. It was more about what they were reading at the time or who they were hanging around and where. Let's face it Keith has flogged the skull theme since the late sixties and it's still going strong....it reminds him of his own mortality, or so he says, strange that he has done everything possible to kill himself through these years....lol, funny guys these rolling sones fellas!