Before, I didn't have an overly feminine voice at all either but I could still sing like that if I chose too (e.x. Lacuna Coil), and in the reverse I could also sing just about exactly like Ozzy Osbourne (I could even mimic Meat Loaf in my mid-teens). But now I can't sing at all. My voice just dies out completely if I try too.
To be fair, my larynx has changed dramatically overall, especially in size, and very quickly (my voice started changing literally overnight after the first dose) so that is the likely reason. I'm sure the complete dying out of my voice at certain ranges (as far as singing specifically, it is anything beyond a monotone) will stop eventually, but as far as ever being able to sing again (and actually sound good doing it)... I don't know. I hope so, but I don't think it's likely. I know my dad can't sing worth a damn so... lol.