Wow, that's a really difficult question! In fact I don't remember the first time I was masturbating at all and so I have no idea who (if any) turned me on to do it... I know I was into softcore movies early on (watching them secretly at night on my little black/white TV), something like "Emanuelle", so it could be Sylvia Kristel. I seldom masturbated only to pictures or magazines, but I remember having posters of Cindy Crawford, Claudia Schiffer and Fiona Butler (the famous skirt-lifting tennis girl) in my bedroom in the early 1990s, so it's quite possible they were on my mind from time to time