What is sauce for the goose is sauce for the gander. meaning

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equality

What is sauce for the goose is sauce for the gander.

declares that:
1.One person should be treated the same way that another person is treated; If one is allowed to do something, then and the other must be allowed to do that thing too.
2. What is suitable or approtpirate for a woman, is suitable or appropriate for a man as well.