Jesus did not address child-molestation either; neither is it one of the Ten Commandments. Does that make it okay?
Humorous since the biblical fathers held that the age of consent was 12 for girls and 13 for boys. In that aspect sexual immorality has been bound to a higher standard than it was then.
Christians know that a gay couple can follow Christ's Law just as well as a straight one and that is all Christians are required to do. For all things compatible with that Law they were given the power to bind and loosen requirements as the times and need requires. Sex is a purely terrestrial dogma, Jesus said there was no sex in heaven - it is exactly this kind of issue that Christians were allows to change as our understanding changed.
So yes, despite what the ChINOs say, it is alright for a woman to teach a man, to have their head uncovered in church, buy a car on the Sabbath, shoot move the Sabbath, take over a pagan holiday to celebrate Christ's birth on a day not His birthday, charge interest on a loan, get into heaven in spite of unrepentant self-abuse, etc.
To real Chirstians who accept Christ's light yoke, marriage equality is in keeping with His Law.