"Ah, but what about gay *couples* getting married?" --- is that your question? "Sure. Like Andrea Dworkin and Jon Stoltenberg," is my answer. Certainly a gay couple --- a gay man and a lesbian --- can get married. Mazel Tov!
But two men getting married, is like triangles having four corners, or me getting the Heisman Trophy, or a water molecule being reformatted to be inclusive of helium, boron and lead. Can't do it without retrofitting the definition in a way that misses the point.
Gaudet urbs Caesariensis,
Virginis doxis impensis
A sancto basilico!