Dear Prudence,
Let me just say, that I adore your column and read it every week. However, I feel inclined to point out how strongly i disagree with your response to the panicked mother searching through her son's cell phone. I myself am 23 years old, and I regularly send risque photographs, similar to ones described, to my long distance boyfriend's cell phone. I have been doing this for about two years now, and trust him entirely with the photographs. I don't think there's anything wrong with this practive, but even at this stage I would never send one unless he asked me to. I assure you that no 15 year old girl, who's been dating a high school senior for just one month would voluntarily send these photos of herself without a little (or a lot of) coaxing from her new older boyfriend. While I certainly agree that 15 is very young to be engaging in such behavior, and high school is probably the worst place to have naked pictures of yourself floating around, it should certainly be noted that the boy should be getting most of the blame in this scenerio.
Speaking from Experience.