The whole idea that most men who engage in homosexual activity are primarily or exclusively homosexual in "orientation" is a remarkably modern theory. For most of history it was generally accepted that any moral concern about such practices was mostly with whether one was the "penetrator" or the "penetrated." The first did not make one a homosexual or an object of contempt, the second most definitely did.
Don't agree with this, but it is historically quite true. Still applies today in the special subculture in our prisons.
What they do with each other is abnormal and against nature.
No amount of mental gymnastics will change that.
If I recall correctly, the Mexicans make also that distinction.
Please correct me if I'm wrong, but I tend to infer the following meaning to these Mexican slang words:
Buga StraightBugarrón Mostly straight, but sometimes has gay sex as a "top"
Maricón Mostly homosexual, especially a "bottom"