In the 1850's, states believed democracy required the people to decide on slavery locally, state by state and territory by territory. Would that have been cool too? This is not gonna open a big can of worms where we legalize beastiality and pedophilia or anything ridiculous like that. If two people want to be married, they should be allowed to, end of. They are people. If you believe in love, you have to believe that everyone deserves love. if you dont believe that everyone deserves love, you do not believe in love. It doesn't affect straight marraiges and a straight guy can go marry 7 girls in 7 years if he wants. Like Celery said, half the marriages in the USA end in divorce, so it's not the holy sacrament religious people are using as a defense. Just let it be.