"Proponents of same-sex marriage point out that "traditional" concepts of marriage in actuality have already undergone significant change.

Polygamy has been prohibited, married women are no longer considered the property of their husbands, divorce is legal, contraception within wedlock is allowed, and anti-miscegenation laws forbidding interracial marriage have been eliminated in most modern societies.

The fact that changes in the customs and protocols of marriage often occur gives rise to the argument that marriage is dynamic, and same-sex marriage is only the latest evolution of the institution.: (Source: Wikipedia.org)