A blond girl comes back from school one evening. She runs to her mum and says: "Mummy today at school we learned how to  count. Well, all the other girls only counted to 5, but listen to me:  1,2,3,4,5,6,7,8,9,10 ! That's good, isn't it?"
"Yes darling, very good."
"Is that because I'm blond?"
"Yes darling, it's because you're blond."
Next day, the little girl comes back from school and says: "Mummy, today at  school we learned the alphabet. All the other girls only went as far as D, but listen to me:
A,B,C,D,E,F,G,H,I,J,K ! That's good, isn't it?"
"Yes darling, very good."
"Is that because I'm blond, mummy?"
"Yes darling it's because you're blond."
Next Day, she returns from school and cries: "Mummy, today we went  swimming, and well, all the other girls have no breasts, but look at me!"
She proceeds to flash her impressive hooters at her mum. "Is that  because I'm blond, mummy?"
Her mother replied "No darling, it's because you're 25.