Funkyderek, for real, for real I took an archeology class on this stuff. It talked about maternalistic and paternalistic tribes. I, also, have seen documentaries about this type of culture too. Maybe, you should take a couple of archeology classes, and then it wouldn't be so hard for you to accept.
Look up terms like:
Matriarchal tribes, culture, etc...
Hunter gatherer tribes (something should come up)
Family Structure: According to a Khasia proverb, the civilisation originated from the female. Because of the existence of a social system based on matriarchy, Khasia girls make their own choice of bridegrooms from tribes other than their own and keep their husbands in her own houses after marriage. Marriage within one's own tribe is forbidden and results in the loss of ownership of property, excommunication from the village, and no funeral after death. Most marriages take place on the basis of prior mating on the part of the girl. Usually girls invite would-be husbands to their houses and sometimes living together also takes place. Guardians are informed of the agreement among the intending parties and fix the date of the marriage ceremony. The males on the bridegroom's side dress the bridegroom in a white loincloth and a turban and take him to the bride's house. The bridegroom is blessed by his mother and senior female relatives. The bride's party welcomes them. The priest recites religious verses and blesses the bridegroom. The gods are offered wine and dry fish. After palatable dishes and drinks the bridegroom's party leaves him at midnight. The bridegroom treats the brothers and sisters of the bride as his own brothers and sisters. Sometimes marriage also takes place on the basis of the consent of the guardians without prior mating. After the marriage is over, a cottage for the new couple is built by the side of the house of the bride's mother. In some punjis this is compulsory. No cottage is built for the youngest daughter since she happens to be the heir of her maternal house and property. The wife does the monetary transactions.