The Trade Between a Man and a Woman
"The gesture of a man opening a door for a woman illustrates how men and women relate. We all know that a woman can open a door herself. But when a man does it, he is affirming her femininity, beauty and charm. When she graciously accepts, she is validating his masculine power. This trade, a woman surrendering physical power in exchange for a man's protection (i.e. love) is the essence of heterosexuality.