Your last sentence shows that you DO judge others since you indicate that only your way of thinking is the 'right' way.

BTW if you are interested in learning a little more about the history of 'marriage' and how it has changed through the years this has a relatively short condensed look at how it has changed even in the last few years.

http://www.livescience.com/37777-history-of-marriage.html

Changes in straight marriage paved the way for gay marriage. Once marriage was not legally based on complementary, gender-based roles, gay marriage seemed like a logical next step.

"One of the reasons for the stunningly rapid increase in acceptance of same sex marriage is because heterosexuals have completely changed their notion of what marriage is between a man and a woman," Coontz said. "We now believe it is based on love, mutual sexual attraction, equality and a flexible division of labor."