Researchers have argued that the "precariousness" of manhood contributes to traditionally-masculine behavior. "Precarious" means that manhood is not inborn, but must be achieved. In many cultures, boys endure painful initiation rituals to become men. Manhood may also be lost, as when a man is derided for not "being a man". Researchers have found that men respond to threats to their manhood by engaging in stereotypically-masculine behaviors and beliefs, such as supporting hierarchy, espousing homophobic beliefs, supporting aggression and choosing physical tasks over intellectual ones.