Yes, a knife is made to cut but it doesn’t mean that I cannot use it to pummel a nail or use it to pry a cog in a machine. But one thing for sure that I cannot do is to call it normal. As per material purpose, there is nothing normal to a knife hitting the head of a nail as compared to a hammer’s purpose driving the nail more efficiently.
Same goes true with my eyes. My eyes’ purpose is to see – quite simple. But what if I use my eyes to give a hint, quote somebody or give a signal. Now, I’m in violation of my eyes’ normal purpose. However, I was able to do it without bothering my thoughts if it’s normal for my eyes to do or not. In fact, all of us instinctively and inadvertently are doing it already as if it’s part of our eyes’ purpose.
Matters like this is elaborated well by Aristotle in his Mean of Virtue »
If we turn our gaze into homosexual cohabitation, we’ve already emphasized that same sex relationship in lieu to human sexuality and purpose, is not normal. But just because it’s not normal doesn’t mean you still need to draw license from the society for you to conjugate as homosexuals. In fact, for humanitarian equanimity, freedom and the so-called equal rights by all means you can do it.
But don’t call it normal.
Something that is not normal is exceptional, or maybe an exception to the rule. What is normal is when human species continue to foster through normal male to female cohabitation.
Let’s try to imagine that one day, all males decided to conjoin with his fellow males and all females to her fellow females species as well. Picture out what will happen next when normal human reproduction suddenly stops all over the world as a result of an atypical cohabitation. Good thing, statisticians and demographist might say, since the world is already overly convoluted with suckers and polluters of the environment. But why would that happen? Well, because it’s the new normal.
But frankly, this isn’t rocket science to understand.