What does it mean to put fishbones on vegetable leaves?

The origin of the joke of putting fishbone on vegetable leaves;

This joke is about a woman having dinner with two men, and then both men are pursuing this woman. The woman asked two boys to introduce themselves, and then I went with whoever she was satisfied with. So, a man suddenly took out a leaf, and then took out seven fishbones and put them on the leaf.

The woman silently exulted after reading it. Then, another man also took out a leaf, followed by seven fishbones, but he also took out a spoon and put it on the thorns. The woman finished reading it and left with the second man without saying anything.

Put fishbone jokes on vegetable leaves;

Put a leaf for one night, and then seven fishbones. According to pinyin, the homonym is seven times.

The first boy said "seven times a night". However, the second boy added a spoon. It means "seven times a night, once an hour"