"in reality women are often paid less for the same role."
In the UK, at least, it is illegal to do this. If you have evidence your company is doing this, take legal action. See the link below for advice on how to do this.
http://www.equalpayportal.co.uk/the-law/
Of course, if you are, like so many propagandists are doing, gather your data on a global scale, or cherry-pick stats from other countries to fit your case, I can't help you.
Biting the hand that feeds IT
