Should gay marriage be legal?

Marriage is no longer associated with sex in society. We live in a society, where divorce, adultery, pre-martial sex, and infidelity aren't legally acceptable. To say that marriage as far as the government is concerned is a sacred union is no longer accurate. As such, it is simply a legal contract between two people, and the right to make just contracts of private individuals cannot infringed upon. Homosexuals will be homosexual regardless if you allow them to marry or not. Giving them the right to form a legal bond is only giving them rights that deserve as humans. Perhaps if our society agreed to not have sex outside of marriage, then you could argue otherwise. But given the nature of marriage in our society, it is unjust to deny homosexuals the right to marry.