I don't know what the 'Law' is called but;
In this world, there are three mighty and divine beings. They rule over men jointly, and each has a specific role.
The first is a dynamic, whimsical god that presides over the fates of men. However, as evidenced by history, "fate" is by no means enduring. It can be as fleeting as the tide. This is due to a curse placed upon this god at birth, to remain forever in a state of restlessness. He cannot help but keep the omnipotent wheel of fate in motion, and no matter how he is restrained, he will always endeavour forward.
Let's just say, men produce a lot of sperm over their lifetime.
The second presides over the hearts of men1, and is as stereotypically deific as a divine being could hope to be, but alas, she too is cursed. At coming of age her form was twisted2and corrupted to be horribly repulsive. While her essence is good and just, and she attracts followers as though guided by an invisible force3, men cannot look upon her else be warded off by her image. Despite all this, she is blessed with a righteous persistence and continues her work unfazed.4This being is quite unique amongst the three, as her earthen feet are grounded, yet her snowy white head is insecure5.
1. Men like women; 2. Puberty; 3. Men like women; 4. Women don't like those howling construction workers; 5. That's sexist.
The third is a strange and nondescript being, neither god or goddess, whom governs and presides over the minds of men. It has no true form, but fleeting glimpses have been recounted as shocking beyond anything ever seen. Almost nothing is known of this being, let alone that its presence is eternal, even though its image, such as it is, may rarely be witnessed.
Beast with two backs.
It is told in scholarly culture that, should man desire an audience with a particular one of these three beings, they need only bring the other two together. Once unified, the third will be summoned. This is a law of nature that men discovered and harnessed for their own benefit. Regardless of how it is used, the three beings subject to it are always willing, if not eager to comply.
Making babies.
What is the name of this law?
Insert bow-chika-wow-wow music here.