I agree with those here who have said that women are better at hiding their true feelings and motives. They're not more liberal at all - particularly when dealing with other women - they're just much more two-faced about it.
Women feel a need to socialise together so that they can build up their power base, because they tend to rate themselves according to their position within a social group rather than their standing as an individual. So they're more likely to say the right thing to try to get you to like them, but their tune will change the minute your back is turned if they think it'll give them a tactical advantage within their peer group.
I've known plenty of women who will smile to your face and then stab you in the back. Men tend to be much more direct.
YMMV, no offense intended, etc.