I am shocked that there are so many YANBU replies. Do anyone of you remember being 13? I imagine sex is just about ALL her mates and her talk about.
I would be mortified if I came home from a sleep over and my mum was worried about me seeing a 15 film / SATC when I was 13. Even more mortified if she then went and said something to the other mum. Cringe worthy.
Jeepers.