On what wrist does a man wear a watch?

Traditionally, a man wears his watch on the left wrist. This custom originated because the majority of people are right-handed, and wearing a watch on the non-dominant hand protects the timepiece from damage and keeps the dominant hand free for writing or working. However, the modern rule is practical: wear your watch on the wrist opposite your dominant hand. Therefore, if you are left-handed, it is perfectly acceptable to wear your watch on the right wrist.