Literally, what is good for a female goose is equally good f

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.

If something is good for one person, it should be equally as good for another person.

https://www.yourdictionary.com/what-s-good-for-the-goose-is-good-for-the-gander

本意是男女一樣，但可以延申