Is it illegal to send nudes on Kik or can you be tracked?

Through an app for iPhones called kik, my friend met a girl and they were dating for a few days. He accidentally sent her a nude picture of him that was on his phone. She got a picture of his face from one of her friends after they broke up and now my friend is scared that he's going to be tracked by the police for it since she might be holding a grudge on him because he dumped her. If she does report this to the police is there any offence? They are both 17, my friend lives in Ontario and she lives in Washington.

He should send and apology for this with and explanation of his mistake, so there's a record of this, and let here know it will never happen again. It is likely nothing will come of this as long as it doesn't continue, and if the picture was not overly lewd.

Yes, it is illegal, and your photos can be tracked. Since this involves illegal activity and can be harmful to children, your post has been reported.