What is a counterfeit?

If I had a coin and both sides were either heads or tails, but not both, would it be legal tender?
If I had a coin and both sides were either heads or tails, but not one of each, would my collection of coins be enhanced? If so, then how?

Except for the "freakish" part which has a certain "sideshow" quality to it, what is it about this "accident" that makes my collection of coins worth as much as it might be, having all coins with heads on one side and tails on the other?

If I found coins like this in my collection, I would conclude that they were not genuine but were, in fact, accidents or counterfeit; but certainly not as intended. And certainly of no use, as such, to the enhancement of my collection.

What about "fake fashion"? Fake Gucci, Armani and the like. Does owning a fake make your attire as valid as that of one who owns the original? Of course, there will be those who prefer the fake quality of their accessories... that may find a certain excitement in having illicit goods. A bit freakish, maybe.

So, what about a same sex relationship, two heads or two tails: does calling itself a marriage make it any less counterfeit to the name and purpose of "marriage" as the word was conceived? Yes, of course it is a relationship. A homosexual relationship; that is to say, a relationship, odd to a purposeful design -counterfeit- and can only be called a marriage if the definition of the word is changed to accommodate this uniqueness, not unlike a freakish find, a counterfeit.

And why would we not just call it something else since it is, in reality, something else? And, if the purpose of heterosexual design is deemed not purposeful at all, as there was no Designer to supply any purpose, then why have a marriage at all? Animals don't have a marriage. They don't need one to behave as animals. It's natural to them to be so.