What is the origin of the idiom "swing both ways" and when to use it?

The origin of the idiom "swing both ways" is rooted in the idea of a swinging door that can move in either direction. In this context, the idiom refers to a person's sexual orientation and their ability to be attracted to both males and females. This idiom acknowledges that a person's sexual orientation is not limited to one gender but includes the potential for attraction to both genders.