These myths that try to induce you into thinking that women are *still* being discriminated in this day and age have been more than debunked already: if there are only 17% of women in IT is simply because they prefer doing other things. In very pro-women countries like Norway and Sweden were women are totally free and indeed encouraged to go for professions typically associated with men, they STILL prefer otherwise. Men and women are different, live with it.
As for the salary discrepancies, if women were indeed much cheaper labor than men, sane companies would *only* hire women: they would save A TON of money. No, people - men and women - get paid in proportion to their competence and time given to the job. So either women are just not as competent as men (they are!) or they are simply not willing to invest as much time as men usually do because they prioritize raising their families and taking care of their children (as it should be!).