The meaning of the term marriage has never changed. It has always meant a biological union of a man and a woman, any changes is a recent distortion to its meaning. It has never meant homosexual acts.

Dear Josephus,

http://members.tripod.com/~berdache_two/twospirit.htm tells about the culture of the American Indians. Some tribes recognise same sex marriage. I don't know why it bothers you so. Nobody is forcing you to enter such a union. However, it certainly has been a recognised form of union.