Homosexuality among animals is widespread. The differences between animals and humans is that they don't have any intellectual taboos.
If humans followed their natural instincts then the naturalness of homosexuality among humans would also be seen as far more widespread than it is already.
I used to study rabbits. I built an artificial warren on a 1/3rd of an acre field. The social structure was fascinating. Bucks were rarely sociable with each other, they tended to fight for supremecy, but the does were always being affable with each other and many seemed quite confused as to their gender.
Cris