Simple, require registration.
Ask gender.
If they answer Male, tell them to fuck off.
Ask gender.
If they answer Male, tell them to fuck off.
I'm thinking that having an "unverified" status is the way to do it. Users who are not yet verified can browse and do certain things, but cannot comment or moderate. Alternatively, they will be able to comment, but at a lower Karma score, or some such.
There is a sizable population on the net that likes to pose as female.
Not just on the net. I'd argue that the only reason it's so much more sizable on the internet is that gender-bending is so much cheaper there.
If gender-bending is not so cheap, then by your logic, you should get different dynamics. I am curious what a social news site for intelligent women would produce. Not a Digg for women, but a Hacker News for women!