I can tell you I've seen some highly-qualified females. This one is probably smarter in computers and mathematics than most of us combined:
Xiaoyun Wang is the scientist continually finding collisions in hash routines.
And then there's this chick who published her first math paper as an undergrad. Never mind, I shouldn't post the picture I want to here. Just google up actress Danica McKellar. Straight to this subject, she's written books to try to get girls motivated in math, and even tutors them over the Internet.
There are always exceptions.
The women hate having to flirt with the geeks in order to get them to do their programs for them. I am not kidding here. The pretty girls always find guys to write their programs—the ugly ones HAVE to be good coders.