How does Mammachi enable Chako’s sexual liaisons with factory women? Why do these women sleep with Chako?

Mammachi knew that factory women slept with Chako because he had power over them. Mammachi accepted these liaisons as long as they had nothing to do with love or affection. Mammachi would slip money into their hands. This validated that the liaisons as only sex. The women, who had families to support, took the money.