No Congress ever has seen fit to amend the Constitution to address any issue related to marriage. No Constitutional Amendment was needed to ban polygamy or bigamy nor was a Constitutional Amendment needed to set a uniform age of majority to ban child marriages.
So long as the system of competition in the production and exchange of the means of life goes on the degradation of the arts will go on and if that system is to last for ever then art is doomed and will surely die that is to say civilization will die.