We did a thorough analysis of our internal submission numbers and found that the unsolicited numbers are evenly split, while the solicited (agented, previous contributors, etc.) were 67/33 male to female. We found that women contributors and women we rejected with solicitations to resubmit were five times less likely to submit than their male counterparts. So we basically stopped asking men, because we knew they were going to submit anyway, and at the same time made a concerted effort to re-ask women to contribute.
A useful reminder that throwing up your hands and saying “Women don’t pitch us; what can we do?” is ineffective and unacceptable. Changing a biased culture requires action.