God commanded the first man and woman to rise, take dominion, and multiply. Homosexuals can attain two of the four aspects of marriage; there are two that they cannot.
They can rise and take dominion, but they cannot multiply and do not fulfill the first statute: they are not a man and a woman.
Society may claim that this definition is old fashioned and unfair, but it is the standard set in place by God.
It’s unwise to think that we can be more humane than God while even dangerous to not examine the consequences and the standards He put into place to regulate relationships.
Marriage is meant to be a true partnership of body, soul, and spirit and can only become so when we submit to God’s ways.