[ If homosexuality were normal and natural in humans then wouldnt all/most humans be natural fully functioning hermaphrodites? ]

Hermaphrodites themselves are rare and only 11 cases of fertility in true hermaphrodites have been reported as of 2010. So if that was the norm, humans would die out. 
Naturality is not defined as whatever occurs in nature, except by materialists. To a moral outlook suicide is unnatural, [in spite of lemmings] and so are other inherently self destructive and or excessively risky behaviours. The overwhelmingly unhealthiness and riskiness of homosexual activity is well established.
As for the terms, hermaphrodite or intersex, it is a biological condition of anatomy, which has nothing particularly to do with same sexual attraction, at least not in that the former is any outcropping of the latter; it being a complex mutation and there being no gay gene discovered as of yet.
Personally I am of the belief that homosexuals require a biological proclivity and a certain amount of personal choice. 
But to the point, that which is destructive to human continuance cannot benatural. But in the way in which suicide and arsenic are natural ie Material Occurrences.