Here is a science story that might make a good plot in EP:
http://uk.io9.com/5774873/a-protein-that-could-destroy-all-men-but-leave...
(the real story: http://www.nature.com/nature/journal/v471/n7336/full/nature09757.html )
Basically, in fruit flies the MSL gene produces a protein that keeps males alive. Block the gene and they die. Now, if humans have a similar gene (and it is not too unlikely, http://www.sdbonline.org/fly/polycomb/msl3-2.htm ) then there might be a way of killing human males. Just some RNA interference, some chemical constructed to inactivate the msl protein or a pathogen that infects people and produces a msl blocker... and no more males.
Might be an interesting bioweapon. And a reason why furies are female - it was already used in a few early conflicts. Sure, modern morphs have supposedly fixed the MSL bug, but can you be sure?
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