What about 50 things girls should have done by the time they are 11 ¾ ?
Your starter for 10 - kiss-chase!
Minor and Minimus both complained that gerls wanted to play that in Junior Skool but they thought the idea was "GROSS!"
I have assured them that by the time they want to play it the gerls will have outgrown the idea. My suggestion was "Try it ~ you will like it" but