I’m not familiar with this clause, but I believe that states that want gay marriage should allow it, and those that don’t want it don’t have to recognize it.
Married homos should be mindful of the states they travel thru if they want to be confident that their marriage is recognized.
Then homosexuals would fight to have their sick perv “marriages” recobnized under the Full Faith and Credit clause or whatever it is called exactly, that all real marraiges are recognized under. Homosexuals would claim that if their “marriages” are not recognized in all states they are second class spouses or something.