One ubiquitously promulgated common misconception based pop-cultural talking point of a myth is that there has been an evolution of marriage so that one cannot claim that marriage between one man and one woman is traditional, normal, family value based, right, true, God given, etc.
Before thinking of an answer, or a counterargument, it is important to think about and dissect the question, the argument.
What does it mean to claim that marriage has evolved?