how about the romans and their big gay bathhouse orgies
Romans traditionally weren't so big on the practice. It happened, and many notable Romans were likely homoloveual, or biloveual, including Julius Caesar. But it was a reserved thing.
Orgies in a Roman sense weren't typically loveual, but rather large feasting parties.
homoloveuality for the Roman man was a thing kept behind closed doors, as were heteroloveual acts. It was un-roman to be licentious and not appreciated. At it's core, love was reserved for the act of creating a child as an heir, and it was to be kept within a marriage, which was a solemn and political act, and behind closed doors.
To be otherwise was un-pious, rude, show-offy, barbaric, and very much 'Greek'.
What I want to know is how far back the said practice goes. There already seems to be evidence that is nature, so there is no point in condeming it. I guess if people wanted to debate nature vs nuture vs dna they could look to ancient greek history. Although I believe it goes back to the first humans.
There's no knowing how far back the practice goes, as far as society is concerned.
Romantic behavious between men go as far back as Homer, which is the Bronze age (approx 5000 years ago), and that's known simply by the survival of the earliest works of oral poetry.
I wouldn't be hesitant to suggest that homoloveuality is an older and natural thing that is as old as humanity.
Humans certainly didn't create it for themselves at a certain point in time.
There's no argument, as far as I am concerned that it's unnatural. Whatever the reasoning behind it, whether genetic, hormonal or anything else unknown, it's not been caused by men.
You could argue perhaps whether or not it is on the increase, and maybe there are reasons for that. But not that it's not a natural phenonemon.