Round faces are different from chubby faces and differ in the facial features also. Basic geometry of the two kinds differs vastly from one another. A round face would have the perfect round shape with the length and the width of the face reading the same size while a chubby face might have extra cheek fat or extra fat due to body fat. Oval face shapes are the ones that would go with any kind of hairstyle. So one has to be very careful in choosing short hairstyles for round faces, as a wrong choice would make the face look more round and chubby.
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).