Hell, women need to be tenacious about their writing in general. AND there need to be editors who are willing to interrogate their assumptions that may determine whether women's stories, as a category, are published less than men's.

Statistics can be found here:
http://www.broaduniverse.org/stats.html. I think this pretty much shows that something is awry--just what is is up for debate--but I'm going to venture that women just not being good enough writers is not one of the factors that goes towards producing these statistics.