Why do muslim girls cover up their hair and body?

• A non-Muslim guy: why do your girls cover up their hair & body?
• Muslim guy smiled and got two candies, one covered and the other not and threw them into the dusty floor.
• Muslim guy: If you were to choose one of them, which one would you choose?
• non-Muslim guy replied: The covered one.
• Muslim guy: And that's how we treat & see our women.