So a friend of mine has two daughters now one is two years older than the other and one day she fount out about that they had been pretending to have sex like not actual sex but kissing and stuff they were 10&12 at the time and she’s stressing is this a big deal or not? She’s heard of kids doing this before but younger when they didn’t know what it meant? Maybe the older one knew what she was doing?? I’m not sure to me I don’t see it as a big deal as nothing happened properly and nothings happened since.