Glad to do so.
Article IV, Section 1: Full faith and credit shall be given in each state to the public acts, records, and judicial proceedings of every other state. And the Congress may by general laws prescribe the manner in which such acts, records, and proceedings shall be proved, and the effect thereof.
Once one state made gay marriage legal, it was all over but the shouting, and arguably constitionally, too.
I don't expect the Supremes to declare that all states must allow same-sex marriages to be performed within their borders, or at least not as a result of the first such case to reach them, but I expect they will require all states to recognize gay marriages performed in other states.
This is not consistent with the way the courts have handled state laws on first-cousin marriages, for example, but then there isn't a massive wave of sentiment in favor of cousin marriage sweeping the country.
Anal sex does not consummate a marriage. The anus is not a sexual organ. Therefore sodomite “marriage” does not exist.
Consummation or consummation of a marriage, in many traditions and statutes of civil or religious law, is the first (or first officially credited) act of sexual intercourse between two people, either following their marriage to each other or after a prolonged sexual attraction. Its legal significance arises from theories of marriage as having the purpose of producing legally recognized descendants of the partners, or of providing sanction to their sexual acts together, or both, and amounts to treating a marriage ceremony as falling short of completing the creation of the state of being married. Thus in some Western traditions, a marriage is not considered a binding contract until and unless it has been consummated.