Just Laughs: A Secretary's Interview

A boss has to interview four girls for a secretary's position. He thought of a question and asked each one of them:

Boss: "A woman normally has two mouths, What's the difference between the two?"

The first one answered:  "One can talk but the other can't."
Second answered:  "One is vertical and the other is horizontal."
Third answered: "One is hairy, the other isn't."
The last one answered: "One is for my use and the other is for my boss."

Boss: You're hired!