This song looks to be a reference to the actress Sandra Dee, as if herself or the roles she played were that of an "innocent" grown up woman.
I'm not much an expert on what roles she played or who she was in real life, but from what I know it's not that their roles were of the type I'm mentioning and I doubt that at the time they'd get to know much about her life. So I cannot grasp the meaning on the song based on that.
What's the reason then? Or am I mistaken in my appreciation?