Originally Posted by TitaniumAnimations
But if this gene is passed down through that way, where in the world was it first conceived, and when... and how? Since genes and hereditary traits are mainly compiled of natural adaptations to the surroundings of the living being, why would one develop such a trait?
Who ever said that organisms can only have beneficial new traits? Hereditary traits aren't compiled out of natural adaptations, they emerge spontaneously and completely randomly. Unless it's something like "all people with this gene die instantly", it will likely be passed down and survive. Homosexual activity has been observed in many animal species.