"Boys don't cry!" is what many fathers tell their sons when they fall off their bikes, or do not make the basketball team. Although they want their sons to be "real" men—the kind who hide their feelings, encouraging boys to keep a stiff upper lip can be harmful.
When emotions are prevented from taking their natural course, people experience anxiety and stress. Bottled-up feelings eventually come pouring out as anger, the only "acceptable" emotional display for men.
Anger is not only painful for those on the receiving end, but also for the men themselves. Research proves that it is unhealthy to repress one's emotions, and that men who do not express their emotions freely tend to die earlier than those who do.
Ironically, the efforts of fathers to instill "manly" behavior in their sons are in vain: In a recent poll, women said that a man is not only manlier if he can weep, but sexier as well.