"Attempts to limit female mobility by hampering locomotion are ancient and almost universal. The foot-binding of upper-class Chinese girls and the Nigerian custom of loading women's legs with pounds of heavy brass wire are extreme examples, but all over the world similar stratagems have been employed to make sure that once you have caught a woman she cannot run away, and even if she stays around she cannot keep up with you. ... Literally as well as figuratively modern women's shoes are what keeps Samantha from running as fast as Sammy."