I tend to disagree for reason of this type behavior characterizing pagan cultures all the way back to pre-history. The hetero-monogamy of Judeo-Christianity is what is anomalous.
When queers reproduce with each other same sex I'll think about your argument, until then I'll stick with ICK. It is just not a natural manner, normally creatures that cannot reproduce become extinct.
But sexual slavery, the imposition of power by adults over child victims and even "temple prostitution" were pillars of the pagan world. So because these things existed in the pre-JudeoChristian era does not mean they were desired behaviors by the recipients of such abuse. And there is no way of knowing if adults who practiced it willingly were the same persons who had been "used" in childhood, as is the case today in a large percentage of adult homosexuals.
If gay sex were natural, we would see a lot more of it in wild mammal populations, but we don't.