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.
My general understanding is that such relationships were dominance in nature, not unlike those in modern prisons... penetrator and penetrated.