Second, insert a knife and have a beautiful abdomen. This is the tradition of a small ethnic group in Ethiopia. This nation is very poor. If a woman wants to get married well, she must bet on her own body: after entering adolescence, girls often cut their skin with sharp tools, and then insert bamboo sticks into the wound to make the wound show a certain pattern. As long as the wound heals, it will become a very beautiful pattern. Local men think that women with delicate patterns are the sexiest.
Third, saliva acts on the body. It's a Berber tradition. It is said that Berber girls have to go through a ceremony before getting married: the mother will collect some henna and then stick the petals of henna on her daughter's face with her saliva. When saliva ran from her face to her feet, the ceremony was completed.
Fourth, parent-child promiscuity. It sounds hard to imagine. In some ethnic minorities in South America, both husband and wife have the right to have sexual relations with their spouses' relatives, that is, the husband can marry his wife's sister and the wife can marry her husband's brother.
Fifth, give women some kind of "discharge" from men. This is the custom of the Siva people in Africa. Local men will put their own "tadpole shit" on food for girls to eat. Once girls eat it, they will find this man very attractive. This custom is really hard to understand.