First off, I really apreciate the oportunity to discuss this issue so openly.  I also ask that you please forgive my awful spelling (it's not one of my strong suits).  In addition, I fully accept and applaud the ascertion that scientific theories should be questioned as that is the only way to refine them properly.  I'm also pleasantly surprised that you have bucked the conservative trend to disbelieve evolution.  However, I would like to point out some flaws in your reasoning.  First, all societies fail.  Although I would argue that there has never been a society without homosexual members, it is highly unlikely that the prevelance or acceptance of homosexuality had anything to do with any individual societies failure.  Failure is a function of time, not homosexuality.  I would also argue that you have mis-stated the fundamental issue.  The issue that you posit would be better stated as "Is homosexuality a lifestyle choice."  If it is not a choice, then it must have biological origins.  Now, biological does not necessarily mean only genetic.  I am aware that at this time there has not been a definitave link established between a singel gene or gene sequence and homosexuality.  It's important to understand that this doesn't mean that homosexuality isn't biological.  As with many complex traits and behaviors, homosexuality is likely linked to a number of genetic, epigenetic (having more to do with gene expression), and hormonal (both in-utero and after birth) factors.  For more on this point, please see:  http://www.sciencedaily.com/releases/2008/06/080628205430.htm or http://www.sciencedaily.com/releases/2008/06/080617151845.htm.  As for evolution, I would first point out that simple Darwinian evolution, while still important, is not the only accepted model of evolution.  Like any good theory, it has undergone extensive scruitany and has therefore been reshaped and refined along the way.  Now, I understand how it may be counterintuative that a trait such as homosexuality could persist in a population.  We know that 2 men or 2 women can't produce offspring so how is the trait passed down.  For one, homosexuals have been persecuited for so long and to such a degree, I think that you'll agree that there has been considerable motivation for them to hide who they are and try to blend into society.  In many cases, this likely involved marriage and the obligitory children.  Other explinations include different models of evolution ( http://www.sciencedaily.com/releases/2008/06/080617204459.htm).  Regardless, the evidence points to a biological origin.     

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