Dear Island man,
Of course, you're right - so much of what we do is subjective, but we could make an effort to understand the viewpoints of other sexualities, couldn't we? Not all human societies have adopted you're attitude, which, surely, reinforces your comment on subjectivity. But, I want to make the point that understanding someone else's viewpoint does not mean that you have to adopt the practises that you've come to understand.
Our Christian backgrounds make us see the world in black and white, which is a quite deficient way to see the world of humanity.
A few days ago I helped an acquaintance, who had to have a hernia operation. He's single, lives alone, (25% of Australians live alone these days) and had no-one to give him some support to get to the hospital and accompany him home. Prior to the day of the operation, he wanted to know something about the operation, so I looked up stuff for him on the internet, and found this video http://www.youtube.com/watch?v=VGVlf6LlQ3s the interesting thing was he could hardly watch it, finding a view of anyone's insides "disgusting" - which is just the word you've used.
I find that puzzling, that this person could feel his own body was disgusting surprises me.
Anyway, I'll prepare a second post on this theme, that will compare western and Asian outlooks on the matter.