Well, from a bass or higher pitched vocal range, it really comes down to how much you actually train your voice.
Sure you might have a bass voice right now, but give it time, and train your voice, you could end up with a very nice female range.
I'm quite lucky with voice, I did some very basic exercises with my voice, and now my baseline voice pitch is within the normal female range, then add inflection and alike, my voice sounds very female and is nice and passable.
Basically, for me, my voice seemingly naturally rose into the normal range, and then just went quite feminine. Maybe it was more psychological for me, and the more female I felt, the more female I sounded.