If a man or woman is hired, one presumes they are the best person for the job. If they are, then they deserve to be paid appropriately and equally. In the high tech industry, men take alot of time off for their families too...because it's a fairly flexible and open-minded industry. They take paternity leave, stay home with sick kids, etc. If gender roles equalize in other areas, then women will miss less time because of kids.
But if the woman was worth hiring, then she's worth paying fully. If you dont want the chance of maternity leave, etc....dont hire women. See how that goes (And I dont mean just EOD...overall, in ALL areas of the workplace and business.)