Because women are smart. The women I've worked with claim ignorance to programming, have no desire to learn programming, and give me a mile high task list of things to do. Then they take all the credit for my work while I'm being worked to the bone. I burn out and quit while they hire the next fresh programmer ready to accept work.

I've tried teaching employees to program, but when they realized how much painful/frustrating work they can now accept with this fresh new skill, they immediately stop learning how to program. Easier to give me all the work.