For men, short hairstyles are nothing unusual since the majority of men in this planet sport this style. These hairstyles are popular for many reasons, such as religious principles (most Christian denominations require a man to have short hair so that his head is not covered when he prays) and one's profession (e.g. athlete, military personnel, or businessman).
Women have some facial features which will look better with short, cropped hair. Always wearing your hair in its natural way or wearing it in straight black hair? Why don't you try having your hair short and cropped?