what's good for the goose is good for the gander

what's good for the goose is good for the gander

If something is good, acceptable, or beneficial for one person, it is or should be equally so for another person or persons as well. Well I guess if you are entitled to stay out until all hours, then I'll do the same. After all, what's good for the goose is good for the gander, right?
See also: gander, good, goose