Why? How do gays being able to marry affect heterosexual relationships?
It has nothing to do with that. Marriage is a religious institution between a man and a women, that's the reason, nothing else. Based on other posts which others have seen I have nothing against gay people. I support gay adoption, repealing of "don't ask don't tell" and I support civil unions.But who's religion? Yours? My Hindu neighbors'? Or how about the polygamist cults in Utah? Certainly not mine, given I don't have a religion. Does that mean the state shouldn't recognize any marriage I'm in, since it wouldn't be religious?
Sorry, but I can't accept religion as a reason. The US is not a theocracy, rather it is a secular Republic. (that's not to say there's no religious influence on the government's decisions, but the government itself is not religious) Marriage as defined by the government is simply a civil contract with no religious implications. Two atheists can get married in front of a judge just as two Christians can be married in front of a priest. If it was a religious institution this would not be the case.