As a guy, I'd love to live in a 50:50 gender ratio house with smart, creative folks. Had that experience in college living in the student cooperatives; was a great time, with lots of creative energy and many lifelong friendships formed. Would be great to do it again as an adult. Living together in a cozy house with 10-40 other people sure beats lounging around in a dank apartment by your lonesome self.
I agree that the gender split is very important, as it fundamentally changes the feel of the environment. I wouldn't want to live in a house with mostly guys, I don't think.
It makes me happy that the other replies point to these kinds of houses existing, but I kind of feel like I'm not "hacker" enough to look for a place like this yet. (Only one tiny project finished & for sale, no startups or anything to my name. Also, I'm hella lazy with my projects! Not sure how much this matters to these hackerhouses, but, well, they have "hacker" in the name, so...)