Not such a dumb assed question
I think that like alot of professions, that flying is male dominated and although yes like anything it is illegal and imoral to discriminate , it happens though it is crap it still happens , you cant say it doesnt happen because that simply isnt true, it does.
There is certainly alot of "old boys/old shool" stigma mentality still attached to it.
Though I think its damn good to see changing, it is still something that is harder for women to crack.
Like the military ( I have served so can comment ) and operating heavy machinery , (can comment there too) is is though male dominated still has women proving their equal worth.
Infact as far as the heavy earthmoving equipment operating is concerned women are far more employable as they take care of the gear far better than the guys do with less bitching.
So to answer your question maybe its that not enough are seen or you may your not be looking but they are there and growing in number's and damn good to see too !!!!
My 2 cents.
It is easier to get forgiveness than it is to get permission !!!!