Gay marriages are inferior to Heterosexual marriages because gay marriages cannot produce offspring.
It is my understanding that the marriage contract was originally designed as a loyalty contract for parental purposes "Before these witnesses." that a woman was agreeing that this man would be the progenitor of her posterity and she to bear his... He was agreeing to perform and take full responsibility for any children produced as well as give them legal inheritance and she was agreeing to carry his children only in her womb and also give him the right to her body to create his offspring inside her.
Thus the idea of fidelity and adultery was created to protect the man in his role as provider and protector as to who he would be obligated to provide and protect and give inheritance to.
I believe the idea that marriage is merely an emotional love-bond between any two persons or things was a gross distortion of what the marriage contract was designed to represent. I believe the distortion came when mankind discovered the science of procreation which enabled him to determine whether or not children would be produced as well as making the state play the role of protector and provider for his children (welfare.)
I agree that the meaning of the marriage contract should not be changed. It was designed for responsible procreation and not for the anus or use of objects for pleasure.