Why do guys wear earrings in their left ear?

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Why do guys wear earrings in their left ear?In ancient China, piercing in your left ear means that this person’s life is in danger and piercing in his ear can protect him from any mishap. For this reason in old ages, sailors had piercings in their ear so they can be protected from any blizzard in the sea and pirates used piercing in the ear for their protection.