" One centimeter was an opening the size of a fingertip. Two and a half centimeters were the second and third fingers, slipped into an opening the size of the neck of a bottle of nail polish remover. Four centimeters of dilation were those same fingers, spread in the neck of a forty-ounce bottle of Sweet Baby Ray’s barbecue sauce. Five centimeters "

― Jodi Picoult , Small Great Things