Crying, and why we do that

This is what i've realised: Different people look at different things in different ways. Ok. Say for people like us, we dont think too much when we cry in front of others, esp, if the other party is a girl. More often than not, we're likely to gain a little bit of sympathy from them. i mean, tears are the universal sign of sadness. We hope to gain sympathy and comfort from it, to the extent that it almost becomes an obsession. i've read that humans will cry when there is no other possible way out. Its so different. I mean, generally when guys see someone crying they think," OMG crybaby" , but when girls see the same thing they say," OMG poor thing.."IDK. hai.