What is the meaning of the joke that couples guess fists to decide life and death?

There was a couple who started talking in high school and went to America together after graduation. They met a pervert who specializes in killing lovers, tied them to a machine and tore them from their stomachs within a minute. The way to survive is a game machine with scissors, stone and cloth. The winner survived, and they decided to make a fist together and die together. But the girl died because the boy gave scissors and the girl gave cloth.

Originally, the two discussed punching cards together. In order to keep the girl alive, the boy gave scissors. If the girl punches as planned, she will win. But in order to win the cloth, the boy just gave scissors, so the boy won. It means that boys love girls more ... but maybe girls know that boys will sacrifice themselves for her, so they want to sacrifice themselves ... So, there is no solution to this question, just as it is difficult to answer who the mother's wife will save first when she falls into the water. Didn't you see that funny joke on the Internet?