Which is kinda odd, because there are many female bassists...just look at the bands who feature female bassists...
Smashing Pumpkins
Coal Chamber
Bright Eyes(atleast a female touring bassist)
Zwan(when they were around)
A Perfect Circle(Initially)...

there are many many many of them, but female guitarists...ummm...Charlotte from Ash and um...Bonnie Raitt,...um...Nancy Wilson...Morgan Lander...no I'm all out.

and Hell Yes I want the ghostbusters face!!!