Got your attention with that one? Allow me to explain before you drown me in deluge of feminism. It's not that I think the penisless (ie: women) can't be in metal bands, or shouldn't be, it's just that even casual observers would likely agree that, for whatever reason, metal as a genre is a pretty big sausage fest. Women are definitely the minority in the metal world, and lamentably their inclusion in bands seems sometimes to be more about image than anything musical (not pointing any fingers *cough* In This Moment *cough*).
And then of course there's Walls of Jericho. Their flavour of metalcore (especially the old stuff that got me into them) might not be up everybody's alley, but that doesn't detract from the fact that frontwoman Candace Kucsulain is more metal than a good chunk of the dudes in the metal world. As evidence, I present exhibit A, "1:43 A.M.", from the 2004 album All Hail the Dead. If this song, album, and band aren't proof positive that women can jam out with their clams out just as hard as men can rock out with their cocks out, I don't know what is.