JFC. You have neatly explained why it’s natural for women to earn less. Why, it’s our own fault!
And now explain to us why the jobs men do are paid more. Explain why fields begin paying more when men enter them or paying less when women are predominant. Explain why women’s work is always devalued. Explain also why men are less likely to bother doing their share at home, forcing women to need to do it all.