“firmly established in nature and Western culture for millennia.”
All cultures.No culture has ever embraced same sex marriage. Not even the morally bankrupt Greek Spartans believed hat they should marry the boys they diddled.
The Spartans didn’t have a lot of the special reproductive surrogate parenting tech that we have now. They were also disciplined. They would not put up with people whining and demanding to be special exceptions. Same training standards all around. Highly competitive, brutal, physical training.