Yawn.... many reasons for this and 'the patriarchy' or unfair hiring practices are pretty low down on the list. Women are also under represented in the military, power workers, sanitation workers, lumbering, and mining etc.  Any thoughts why? Sorta like men's under representation in nursing and HR. And I for one am happy that I get a best qualified nursing rather than staring at a male wondering whether he's there because of social 'justice' policies.