Thank you for the correction.
"There is no reproduction, and so instead of increasing the reproductive Capability : Lifespan it actually decreases it. Just because it exists already in nature, doesnt mean it is evolutionarily benificial. It just means its one of those things that evolution hasnt dealt with yet. "
Actually, homosexuality (if it should become a larger phenomenon) could very well be one of the things to save the human race from overpopultating. Several species (mainly fish and amphibic ones, as they are the ones with the ability to do so) change sex once their population has reached its peak, to prevent overpopulating an area. Humans, not being able to change sex by ourselves (surgery to do so has not been around for long) just like many higher evovled life forms, have homosexuality. The Earth can, according to studies, support around 5 billion people. Since we are waaay past that mark, homosexuality is not a perfect, but a rather good evolutionary solution. Homosexual individuals do not add to the population, but can take care of children of heterosexuals (thus supporting the population without adding to it, making for a better whole). So while homosexuality would not be profitable to small populations, overgrown ones like ours would benefit greatly from not labeling homosexuality as a sin.
Abouve statement is of course from a non-religious viewpoint. I can understand why homosexuality would be ruled a sin to, for example, the early christians (Adam and Eve would not have gone far without each other... but then again, I guess God could just have used some more dust and ribs....). But in our modern days, I believe that we should not label homosexuality as a sin any more than we should lable most of the (to me) riddiculus prohibitions of the holy books.