Maybe they don’t call it statutory rape in Illinois but they both broke the law simply by having sex and both could have been charged for it.
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More than likely that’s a misdemeanor due to the closeness of their age. Obviously there are a substantial number of kids have sex in their mid teens...always has been. It was not different when I was in high school. But even the biggest moron at my high school would have known that filming it, taking pictures of it, or even recording it, and then bringing it to school for others to “experience” would have been a huge deal.