David,
 You seem to be implying very heavily ( twice already)  that the homosexual practices of ancient Greecs somehow  were peculiar to them and cast doubt on their fighting ability and masculinity. Homosexuality was with us for ages, and was widespread. Persians, from antique times to Abbas-ian era and to now were equally involved: they always had brisk market in pretty boys ("surker") and castrated their young captives to preserve their "youthful" appearance.  
 Even in modern Saudi Arabia, the bastion of consevative Islam, it is so widespread, that the country  is regarded as  "gay heaven"
http://www.theatlantic.com/doc/prem/...y-saudi-arabia
 It is not what one does in bed, but what one does on the battlefield that determines military prowess: bisexual Alexander's Macedonians  utterly  destroyed equally bisexual Darius' Persian army despite numerical inferiority.
 Let me assure you: there is "sin" even in Cincinnati