On the causes of sexual orientation

Hoot Mon,
there are many instances of homosexuality in animals that are quite natural. The highest occurrence of this is in the Canada Goose population. I believe it is twenty-something percent of the population that that is homosexual; and there is a reason. As you might know, Canada Geese mate for life, so if one partner dies, the other will leave its young and stay with the dead mate. The homosexual couple will then come in and care for the young and/or the "widowed" mate. This is only one example of how homosexuality is helpful to the animal community, not "detrimental."
-Nausicaa13

There's also a book called "Biological Exuberance" that has a lot of that information in case any of you are interested...