Artificial? I would say cultural. I would surely like there to be more women in CS. There are literally no women at my office, and the only women I met for the last six months are from HR. I am single, and so is about 50% of my coworkers - this is not a particularly good position to be in on the 'relationship market'.

On the other hand, I can't blame women for not wanting my job. IT has a reputation for attracting white, male, introvert nerds - and like many prejudices, there is some truth in this even if this is only because of the self-fulfilling aspect of it (I certainly do conform to this stereotype to some extent). It has been shown that females are generally more attracted to fields evolving around social interaction - and IT has quite a bit of the opposite reputation.

If we compare the situation in CS with the situation in sports the situation does stop appearing to be problematic. We never get worked up about the lack of male cheerleaders, ballerino's (have you even heard that word before?), or that few women play football. I fail to see the point of getting worked up about this specific example of inequality of participation.