There is none. It's a leftist tactic to drum up support from the weak minded/willed. You couldn't get 5% of the women in this country to acknowledge that there such a thing. It's mainly a way to get corporations to donate (extortion) money so that they're not accused of being sexist. Ask Paula Deen about how the cry of "racism" can intimidate a corporation. There can be a reverse affect though. You'll never see me in a Wal Mart or Target ever again.