That girl is cute! Yeah she is def. not as hot as her other three sisters that live in town, but she has all these cool friends that work for the UN. She is a real free spirit, takes you out to the coolest ethnic restaurants (with her you've tried real ethiopian food, ate afghan with your hands, and she even introduced you to vietnamese pho!) The only ding is that she NEVER pays. Even if you ask her politely to "split" the tab.
Sometimes when you're asleep at home, she'll sneak into your room and steal money from your wallet. She'll then use that money to hire personal chefs and send her favorite shitzu on vacation to Bali. Upon seeing pictures of George Bush, she wipes her backside with them and forms multiple swatstikas on his forehead, decrying that he is "worse than Hitler." She smokes herself silly, attends pro-Ahmadinjad/Chavez rallies where she preaches peace and Death to America, and then charges police officers with knives and baseball bats at World Bank protests.
Despite all that, however, things progress and marriage appears imminent, until she finds out that you are not Jewish and she dumps you. You hold the door for her as she exits your life, and she just kind of gives you the "of course you should be holding the door for me" look as she proceeds to open the door right next to it and walk out. It is the greatest relief of your life.
Daddy then buys her a new boy-toy to play with.