Louis, your quote from the "Symposium" is badly taken, Socrates advocated non-sexual love as the ultimate form in the dialogue and resisted the homosexual advances of Alcibidies. While Plato may himself have been a homosexual, and was certainly enamoured of Socrates; "Platonic love" is explicitiely non-sexual.
As far as Greek texts, you will have to cite a Patriarch from before 300 AD or similar aurthority if you wish to argue for "legitimate" homosexuality in Christianity. Nicaea banned homosexuality, I believe. Certainly John's Gospel was edited before then in order to remove an ambidious massage used by Greeks to argue for homosexuality. Personally I think the editing was unnecessary, the passage was vety tame.
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