There are several ways to tell the difference between a guy and a girl: length of hair, ability to drive a car, absence of a penis, etc.  But one surefire way to shout your gender from a mountaintop is what you post on your dorm room wall.  Your dorm room says a hell of a lot about you.  If you have a poster of a dolphin, you want to be a marine biologist (or you’re just lame in general). If you have a poster of  Scarface, you like violent movies. If you have a poster of a dolphin next to a poster of Scarface, you might be a future serial killer.

For example:

 

Girls like animals…

Guys like animals humping…

Girls like the beach…

Guys like Kate Upton on a beach… (or anywhere)

Girls like Harry Potter…

Guys like The Godfaddah…

Girls like quotes…

Guys like quotes that matter…

 

There you have it. Choose wisely.