I guess the point I am making is that most people would openly deplore two siblings in love, even more so a father and daughter, or mother and son. And few would have time for a man with three wives. I'd imagine even large age gaps, say 20 years or more between a couple would attract open disaproval from many people.

In all of these cases, those condemning would not be judged as being bigoted or phobic against these lifestyles, it would just be accepted that such things were wrong and deserved scorn.

But with homosexuality it has been so massively campaigned for that people's attitudes have switched so strongly that those who say they don't like it are the ones classed as immoral.

It's an interesting paradigm shift.