According to you. If you follow strict constructionism, it is jiggery-pokery, nothing more.
There is no "strict" constitutionalism. Try to prove that equality before the law for one adult, or two adults even, isn't unconstitutional?
One is a Christian, one is a Jew. One is a Christian couple, one is a Jewish couple. One is a gay man, one is a straight man. One is a straight couple, one is a gay couple. Show us where the Constitution says we can treat them differently, using your "strict" definition?