The original Chamorro society was an interesting mix or balance of positions. To say it was a matriarchy is to simplify things too much. As I understand it the property went with the woman into the man's house but the children went to the woman's family. Since everything was close knit the woman was still there to help raise the child and since it was the expected norm of the time the shift wasn't disruptive of the child's psyche.

There was a men's house where the single men stayed once they were considered men. Older men were they as well. It was no fraternity house, it was a school. The young men were there to learn. There were mature women who were selected to go into the house at night to teach the young men what women wanted from a man. If she got pregnant from the lessons that young man was considered virile and had a higher standing in the village. The woman in no way carried any kind of negative stigma from the job. It was an honorable position and the child that came from the union was a special child, cared for by the whole village.

Of course the Spanish destroyed all of that. The people were forced into Catholicism and lost their way of life. But you can see some vague holdovers from this society. Single pregnant girls are not ostracized, children are not abandoned, and single mothers have the love and support of the extended Chamorro family.