I'm with Whirls on this one. Most of us girls just aren't interested, just as I am totally uninterested in golf or train spotting.
I actually LIKE being a flying instructor, am just not interested in airline flying... Shift work, marginally less boring than sitting in cattle class, away from home a lot, and having to put up with company politics doesn't float my boat.
Similarly I am just not interested in having screaming kids living in my house and taking over my life. God forbid, they might turn out like me. Quite happy as Auntie/Godmother, thanks!
I have had male and female students that are rubbish at flying, and male and female that are brilliant, and all stages in between. One the whole the way males and females learn, retain knowledge and problem solve is very different, which is what makes the job interesting, but the outcome is generally the same.