The Greeks also sent their young boys off to have sex sex with much older men, as part of their path to becoming adults. We'd consider that repulsive by today'

The Greeks also sent their young boys off to have sex sex with much older men, as part of their path to becoming adults. We'd consider that repulsive by today's moral mores - so I'm not exactly sure that 'they once did it' makes it 'ok'. They also had slaves and were cool with that. But more broadly, the notion of sex, sexuality, social mores, relationships varies a lot and it's difficult to contextualize. While the Romans had a lot of 'same sex' and generally mightn't have been ashamed of it, they didn't have same sex marriage and there's nothing to indicate that people thought it should be appropriate either. So we have to think a little bit about how a society with so much 'same sex' would have thought of 'same sex marriage' as utterly bizarre and possibly immoral. Even in 2018 these things are still contextual from one place in the world to the next. That makes it hard.