I decided there are two ways to approach this, one is to try to define girls and the other is to talk about their secret socitey.

Defining Girls
I know better than to even attempt to do this one myself, because like most other guys, I'm clueless about what women are made of and how they work. I have sought out the research and theories of others on this one.

Their Secret Society
Men have wondered if girls have a secret society since the beginning of time. I believe they do have a secret society and have since Eve! I don't know how she managed to have a whole society being the only girl in existence, but if she was tricky enough to steal a rib from Adam so she could exist, I think she can pull that off too!

Talk about girls on the Message Board!