Well we all watched those movies when the chick gets on the bike with no helmet on and the wind beautifully blows her hair. Well DON`T DO THIS. Because a) probably the motorcycle is not moving and that`s some big fan and b) even if they are actually riding that`s wig on her hair for sure.
Wearing helmet is the most important thing so not wearing one makes you look stupid, this is the most important because it protects your head in case of crash. So kids wear helmets and look stupid , its better looking stupid than missing half of your head.