I actually know the first woman, Tricia... used to work out at the same gym as her, down here in Arizona.
While I don't know her that well to be able to discuss all her secrets, my estimate is she has done something. She is only about 5'2 or 5'3, and her voice is frigging deeper than mine! She also displays the typical over enhanced jaw. So if she is natural, she has an inordinate amount of testosterone, which I just don't think is too common among woman.
Now I don't mean to bash Tricia, she has an amazing physique, and a very dedicated lifter... plus she does a ton of cardio, and stays very lean year round. Also, the few times I did chat with her, she seemed very nice and did not have an attitude or ego at all.
However, I always wondered what she was doing in the chemistry department... especially since she didn't train for sometime and has only been back into for maybe 4 years or so.
Just my two cents,