A boy should marry among his own people, but it is not customary for him to marry near kin, a first cousin. To have relations with a sister is othlang. Of such a boy, people would say, “There are so many girls, yet he did not have the courage to go with them, he went with his sister.” If he did go with his sister, he would be thinking at the same time of another girl. And for this reason, a sister, realizing she was a substitute, would feel outraged. A really weak-minded boy would even go with his mother. It is possible, for it is all in the dark, and no one speaks; merely some one will come, some one will go.