> I guess it comes down to this: I don't see how sex matters when you're a business person, when you're programming, when you're building things.

I'm sure you believe this yourself, you behave like this, and you have probably witnessed this a great deal - but this doesn't necessarily generalize.

However, there has been a lot of (empirical) research into this area and it's shown that this still is an issue. For example: http://psy.ex.ac.uk/seorg/glasscliff/