True. Actually, the story goes that the Brahmin males imposed themselves upon the Nair females, and it was Ok, because the brahmins were "superior". I dont think it was even a marriage.
Then again, that has happened all around. When people narrate stories in ancient times of couples not having babies and going to Sages for aashirwad, and behold the lady gets pregnant, how do you suppose that really happened? Seriously?