Well, if the liberal Politicians in DC were so hung up on Women's equality in pay, then they would pay their women staffers the same as the male staffers, but ... they don't.
And if women do really work for less, then any bright American Entrepreneur type would hire only women, because it would cost them less, giving them a substantial advantage in the marketplace.
However, those things are NOT true. A man typically works every day possible (gaining experience), and women take time off to have kids and whatnot. The fact is, men's priorities are always the same as women's priorities. Again, Gender Attractions and men and women tend to be different.
It isn't always HeMan's Women Haters Club conspiracy. And again, it doesn't speak to workplaces that are woman dominated, like cosmetology and nursing. Where nobody complains about over representation.