My DD and her friends came home one day this week saying that a couple of boys in their year kept following them and saying 'Bet you give good head' and then going on to explain in detail exactly what they meant when they looked puzzled.
The teachers have spoken to the boys and they have written the girls letters of apology. However, the boys parents haven't been told about this by school, they will only know if their boys chose to tell them which I think is highly unlikely.
I know school is in a difficult situation as this has obviously come from home, not school. They all have older siblings and probably pick up on stuff earlier than those kids without. My DD knows about sex but I didn't think I'd have to go into detail about oral sex at this age. I'm also slightly concerned that these boys might try and pressure them into trying this stuff, who knows! Or am I getting carried away here. Give me some perspective please, normal playground stuff that they need to learn to deal with or is it completely out of order.