mar·riage ( P ) Pronunciation Key (mrj)
n.

1. a. The legal union of a man and woman as husband and wife.
b. The state of being married; wedlock.
c. A common-law marriage.
d. A union between two persons having the customary but usually not the legal force of marriage: a same-sex marriage.
2. A wedding.
3. A close union: “the most successful marriage of beauty and blood in mainstream comics” (Lloyd Rose).
4. Games. The combination of the king and queen of the same suit, as in pinochle.

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In my opinion, as an non-US citizen, it should be outlawed everywhere. It is unnatural; it is not marriage. It goes against the very foundation of 'marriage'. It raises all kinds of issues, especially in regards to child-ownership and whatnot.