It is true that women, on average, earn less per year than men do. It is also true that 22-year-olds earn less, on average, than 40-year-olds. Why is the latter not an example of age discrimination, while the former is seized upon as an example of gender discrimination?
If women truly did earn less for doing exactly the same job as a man, any non-sexist CEO could thrash his competition by hiring only women, thus saving 25% on employee salaries relative to his competitors. Are we to believe that every major CEO and Board of Directors is so sexist as to sacrifice billions of dollars of profit? When the 'Director of Corporate Social Responsibility' of a nun congregation wrote to TJ Rodgers, CEO of Cypress Semiconductor, that his company should have more women in its Board of Directors, Rodgers replied with a letter explaining why the pursuit of profit could not accommodate such political correctness.