Well I think it would be sexy to hear a woman make the key sound.

I don't think it would necessarily be helpful for a woman to speak, but to make the key sound maybe. Although I practice sparingly, when I've been practicing I've been trying to match my voice with yours to see if I am doing it correctly. This along with feeling where I am tense when I make the sound is the most important thing. If a woman is trying to match the sound you are making, it may be easier to match it with another woman's voice.