The Fumiko clan has been known to run local brothel and has spread from village to village. The history goes way back. The Fumiko woman seem to know how to please both men and women alike and the reputation of Fumiko brothel had been widely known through the world.
The male Fumiko however are great warriors who fight fiercely and merciful. They seem to never stop under any circumstances at the goal and that in itself was how the brothels had started in the first place. The lonely women need something to do while the men were away.
As the years went on the women had slowly dwindled away from the family business and were starting to venture on their own. Some would head away from the families and some would continue the business.
Kayo's grandmother moved to the leaf village and became a cook to earn a living. She encouraged her daughter not to follow the family business but Aimi Fumiko didn't want to earn a living. She wanted to find someone who would pay the bills another way. Un-married, she gave birth to Kayo and continues to seek companionship each night from a different person who in return pays her bills, the family tradition seems to have slowly started to grow again through this even after the grandmother has died. Kayo becoming a ninja has done something no other member of the clan had done before and with her hope to end the tradition is still alive.