Yes, absolutely!

Semantics defines how we as a society govern ourselves and binds us together with a common language of understanding.

I'll leave aside the religous, cultural, and historical significance surrounding the marriage bond being only between a man and a women and discuss the literal reasons instead.

So, why quibble over semantics? What does "STOP" mean when you come to an intersection? We, as a society, rely, as we drive through that intersection, on others to understand what this word means. Those that get ticketed for running that sign will quibble that "STOP" meant simply slowing down.

I am married. When I tell others that I am married they know that it is to the opposite sex. They know that I am married to a women and by default that my children have both a mother and a father. This is important to me and to others that I may communicate with. I shouldnt have to further explain that I am married to a women, another man, a goat, or whatever...

A commonly defined set of Semantics is the bond of any strong society. When we start diluting the specific definitions of words the society becomes weaker. We are already experiencing this in our country where words such as "Democracy", "Rights", "Equality", etc are now so bastardized and incorrectly used and understood that these words rarely convey their original and very important meaning, much to the detriment of our society. Over time, words can lose their specific definition and ultimately mean whatever one person wants that word to mean.

This is a dangerous trend and a very slippery slope...