My concept of normal means “what most people do.” Therefore, by that definition, unfortunately heterosexuality is normal and homosexuality, no matter which way you want to look at it, is simply abnormal behavior. Now this abnormal behavior may simply be natural in the many homosexuals who simply got wired up that way as they cannot change it.
But we can say the same thing about so many other things, including many chronic illnesses like schizophrenia. Sure it is natural for schizophrenics to have schizophrenia because that’s how they got wired up. On the other hand, schizophrenic thinking and behavior is simply abnormal because 99% of the population does not think or behave like this and 97% of the population doesn’t even think or behave that way a little bit.
We can also define abnormal and not only minority behavior but also minority behavior that, if engaged in by the majority, would be a very bad thing.
If a majority of society were homosexual, that would not be a good thing at all. In fact, it would be utterly abnormal and society may well collapse. Therefore homosexual behavior is abnormally because surely you can’t have a world where everyone acts this way.
Schizophrenia is abnormal because if a majority of people were schizophrenic or even quasi-schizophrenic (Schizotypal Personality Disorder), society would not work at all, and in fact it would probably completely collapse. You can’t have a world where everyone is schizophrenic.
The problem with defining abnormal as minority behavior is that we run into problems. Being a great football player is abnormal in a sense. Only a few folks are like this. But society would not collapse if everyone were great at football. Society might be pretty weird, but it wouldn’t fall apart.
You can think of many other examples of behaviors that are objectively good or positive but are minority behaviors because the majority don’t behave that way.
In order to get out of that conundrum, we should define abnormal as:
1. Minority behavior.
2. Behavior that is either non-adaptive or would be highly destructive if a majority displayed the behavior.