What makes you a male or a female? Is it the XY chromosome combination? No. Is it having a beard or not? Nope. Is it wearing make-up? Nah. Is it having a penis? Of course not! Is it the ability to have babies? We could go forever talking about the physical and psychological characteristics of what makes a human being a male or a female. In this world, where the lines are so blurred (I mean, men giving birth and wearing makeup, and we all know at least a couple of women that could use a shave) we constantly wonder what is it that makes us one gender or another.