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I can’t understand the English joke. I don’t know what it means?

A Chinese man called his boss: "I'm sick and I won't work anymore." The boss said: "When I'm sick, I'll go back to fucking my wife. You can try this." 2 After an hour, the Chinese called back and said: "I'm much better, you have a good family..."

That is to say, the boss meant to let the Chinese fuck his own wife, but the Chinese did it instead Got the boss’s wife...