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

Etymology
From earlier (1670s). Other early forms include “as deep drinketh the goose as the gander” (1562).

Proverb

 * 1) Literally, what is good for a female goose is equally good for a male goose (gander); or, what is good for a woman should be equally as good for a man.
 * 2) If something is good for one person, it should be equally as good for another person; someone who treats another in a certain way should not complain if the same is done to them.