The Breeder's Guild was founded on the idea that getting people to mate with monsters all across the Empire would put a stop to monster attacks once and for all.
The Breeder's Guild was founded by Saint Lily about twenty years ago.
Thousands of years ago, the Goddess of Order blessed the Empire with the power to conquer the entire known world. The Goddess of Chaos was enraged by this, and in response she unleashed monsters on this world. Monsters didn't attacked humans very often, only occasionally slaughtering or raping people.
But as the Empire expanded, the monster attacks became more frequent, leading people to believe a second Holy War was coming. A huge force of monsters gathered to attack Northtown. Lily was the head of the detachment set by the Empire to face them.
Lily told the Empire's forces to stand down, then went to face the monstrous hoard alone. She stripped off all of her clothes and mated with every monster in sight.
She mated for three days. Eventually the soldiers started joining in, then the townsfolk.
After all the mating was done, the monsters were tamed and docile. In fact, all monsters in the surrounding areas started to calm.
Lily had realized that if suppressing desire caused the monsters to become hostile, then indulging in them should make the monsters docile. Lily had completely revolutionized the way people dealt with monsters. However, this went completely against the teachings of the Empire. Lily was stripped of her rank and excommunicated. Despite this, the townspeople started referring to Lily as a Saint.