Im going to take an atheistic approach for a moment here. Not something I do very often, but still, Im going to do it nonetheless.
As stated in Richard Dawkins, The Selfish Gene, The driving force behind evolution is survival.
---Ill be clear here, that Richard Dawkins WASNT trying to set moral standards. He was just saying how things are on an evolutionary level.---
Now, I do wholeheartedly believe that he wasnt trying to set moral standards, and just try to state things as they appear, however, how they appear is simply that if you do not reproduce, then you do not fulfill your purpose of self preservation. The goal, is to be able to have the best (reproductive Capability : Lifespan) ratio as possible.
---Im going to make people angry here, especially if you have homosexual friends, so sorry, I give a heads up that this is not how I feel, however, this is my view with my religion pushed aside---
Turning pure homosexual, does not reproduce, unless you do a sperm implant, and that isnt as effective as the normal way of getting pregnant, therefor it is more or less a step down the evolutionary chain instead of up.
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Now that I said that, let me go about and defend myself a little
1)As I said, all of that is just science there. No feeling, no religion, no nothing. I wasnt trying to be politically correct, and if someone thinks the post was too out of line, then I will gladly delete it.
2)I am not saying that people should have sex as soon as they are able to repoduce.
3)I am not saying im against birth control by this post.
4)I am not saying go out and have as much sex as possible so that you keep your reproductive capability as high as possible.
5)Honestly, even though I dont agree with being homosexual, I would never do any sort of hate crime towards you, as I in the same token, I believe that we should all be free to make our own choices.