only about 11% of the founders we fund (and our applicants) are women (and this is a fair amount higher than the percentage most other firms fund). it's a big untapped pool of potential founders, and we'd like to continue to get the message out that women can start startups and YC can help.
If YC wants to cater to women and see that percentage of their applicants grow, they need to analyze their current stock.
You're asking it because you've heard other people ask similar questions in similar circumstances, not because you really want to know -- even if it wasn't pretty obvious[1], there are plenty of resources out there if you search for them.
1. Since most founders are male, if you compared what they want to what the typical founder wants, there wouldn't be anything interesting to talk about!