The thing is, people (women and men) were talking in a similar way in the '80s — I was there. In CA. This has been a long time in coming, and I don't believe it was every especially isolated to females. Also, the phenomenon of "vocal fry" (that sort of gravelly sound made by younger people, usually near the end of a sentence)—that's not new, either. I happen to like it, and I remember listening pleasantly to girls who talked that way in the '90s, and possibly before.