'Two people becoming one flesh' I think you'll find that that's cannibalism.
You don't want to confuse that with marriage... not gonna end well, not for both of you anyway.
'after the fact politically correct version.'
That's a long-winded way of saying current.
There was a period in history when homosexual people started being discriminated against, laws were put in place to prevent it, definitions and language has been updated to recognise this.
If people hadn't been discriminated against in the first place there would be no need for language to protect them.
The language that protects them, or is at least supposed to, is what you call 'political correctness'.
If someone happens to be born male, white and heterosexual, I can see that they might not understand the importance of language that protects people against discrimination.
I can also see how those people, despite society prioritizing them, might feel like they are missing out on something.
That's why Straight Pride exists.