Columnist E. Jean was asked (in a an Elle issue) regarding Girl Code and she gave the following suggestions. Plus I added my own repertoire and a few of my own rules.
Never hate a woman you have never met. Except reality-tv-stars. They are practically asking for it.
Never date a friend's ex. Unless you don't want her as your friend any more. Then go right ahead.
Never reveal another female's secret. 'Coz that's just rotten. That's what we need to learn from men.
Never leave an inebriated friend alone at a bar. That's something a guy would do, and that's more of a reason why we shouldn't.
Never invite a friend's enemy to the party. You gotta stay together to survive this war.
Never dine alone with a friend's boyfriend/husband. Unless she is already dead.
Never stay quiet when a friend is falling for an asshole. You will only save time 'coz let's face it, you will be cleaning the mess later anyways.
Never trust a girlfriend who dates married man. There are simply no excuses.
Never favorite a friend'd sarcastic tweets. Always retweet them.
Never give four stars to a friend's business on Yelp. Always give five.
Never give constructive criticism on your friend's Facebook wall. Give it to her in person.
Never agree with your friend when she self-deprecates herself. Tell her her best qualities and save the day.
Never treat other women disrespectfully. It gives men ideas.
Never discourage a friend or her dream. Be supportive and kind.
Never give dishonest feedback. That ain't helping anyone.
Never bail on a friend when she is down. Be there no matter what.
What are some of your rules?