What day and age do you people live in? 6th grader wouldn't know these things? Put this into consideration:
1. Depends on how they were raised by their parents.
2. Who they hung out with growing up. (IE: Friends and Cousins or any perverted family member)
3. Kids are having sex at younger ages or experimenting.
4. Kids that are young, that look older. (How many times have you been fooled by their age or lied too?)