Homosexuality, from a scientific and evolutionary point of view, could be seen as a form of natural selection ie. the weak resort to homosexuality and thus don't produce any young whom would be weak and affect the plight of the species. When I was reading an article in a New Scientist magazine it said something about Humans naturally and subconciously avoiding those whom may carry disease, such as homosexuals and the overweight, for those were signs of ill health and disease. From a cultural point of view it is sometimes seen as tradition in certain cultures, particularly african tribes, where homosexuality is involved in reliogious ceremonies and rituals. Anyway, from my point of view I fully support the gay/bi movement, as I am Bisexual.