This is historically narrated in the holly book. And if this is the case, the issue of gay marriages has a long way to go. Marriage is a symbolic state that is life-long unity between man and woman. Sex is believed to be an exclusive issue in this bonding. It is also the key to privileges, rights, and freedom of choice.
Married couples share most of their properties and are exclusively united by their marriage vow.
In countries like Kenya for example, married couples proceed to paid vacation whenever a baby is born in that family. The man is expected to go and help the breastfeeding mother while the woman is given rest to nurture her new born. From all these texts, it is obvious that the baby born by the family is the replacement and unifier. Again the issue of gay marriages is in jeopardy. The right to marry should be left to individuals not the government.