Why are plumbers and programmers alike seen more as a male profession, and cosmetology a female one? There's no evolutionary basis for it - feats of strength and endurance kind of go out of the window when we're all utilizing tools to minimize the job's physical impact. Lawyers certainly aren't reliant on any gender-specific genetic traits to perform their job.
It seems as if most readers here seem to be missing the picture: much of these biases, and they are biases, are entirely cultural, not sex-specific. There is a /cultural/ problem with programming that causes the field to innately repel most potential female programmers.
Saying that there's some things women do and some thing men do, and never the two shall meet, isn't just an obsolete 1950s attitude - it's like a bunch of schoolchildren whining about cooties. Asserting that the field /shouldn't/ try and attract a more diverse workforce has all sorts of nasty underlying implications that I'm sure most of you don't mean. The tech industry isn't and shouldn't be a boys-only club - it should be an industry that prizes intelligence and capability above all other factors, especially gender.