In my previous assertion, I stated the social causes for homophobia - and the social structure in general. However, I didn't make any determination of the reasons for homosexuality in the first place - though less important, this is arguably more interesting.
My argument:
Premise 1:Species with high intelligence have social behaviors which are apparently useless. For instance, dolphins have been known to willingly travel in circles, and humans obviously have a host of pointless or even self-defeating group behaviors. These behaviors are not seen in lower cognitive species, which are entirely devoted to survival, such as ants.
Therefore, intelligence is correlated to unnecessary social behaviors, suggesting that over-intelligence can result in useless and even self-defeating actions.
Premise 2:Homosexuality becomes more and more common in species with higher intelligence, and is almost non-existent in lower cognitional species.
Therefore, homosexuality can be inferred to be correlated to intelligence insofar as species incidence.
Premise 3:Homosexually does not contribute in any way to human survival.
Therefore, homosexuality is an inherently unnecessary behavior.
Conclusion:As shown by Premise 1, hyper-intelligence has unprecedented consequences - behaviors which are not directly correlated with survival, and as per Premise 2 and Premise 3, homosexuality is one such behavior.
Therefore, homosexuality is a result of the status of humans as over-intelligent.
Intuition:With farming development, humans moved to fixed living locations - which were better environments for viruses and bacteria and less suitable environments for parasites.
Parasites have been shown to be inversely proportional to intelligence levels.With the rise of civilization, the severity and systemic status of parasitic infections amongst humans dropped dramatically - thus resulting in an already hyper-intelligent species jumping from the level of current great apes to the level seen today in the course of a few generations.
Humanity had no conceivable evolutionary need for a level of intelligence so much above that of every other species, and this level had never been exposed to evolution's optimizing. It was unknown territory - and so were its consequences.
As per the conclusion above, homosexuality was one of those unknown effects.
Therefore, homosexuality is indeed
unnatural, in that is an unplanned byproduct of humanity's excessive intelligence. However, it is the same category as all other objectively odd social behaviors - such as religion, nationalism, marriage/monogamy, e.t.c.
Thus, I am currently of the opinion that homosexuality shares its origins with the rest of humanity's advanced behavior, and is not unique or an outlier.