It is a sin for same sex couples to be married.
1Co 6:9 Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,
1Co 6:10 Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.
We also read in Corinthians where it talks about marriage being between a man and a woman, as well as God destroying cities because of Same Sex Marriage. Before the change, same sex marriage was illegal. It's time this law be reversed and Same Sex Marriage be BANNED.