>>125155587Monogamy isn't really a thing on Themyscira, and certainly doesn't align with Marston's ideals.
Some Amazons seem to have life partners that aren't explicitly romantic/sexual, while the implication is everyone just has sex with each other.
In the Golden Age, a character named Mala was her implied partner, and she's popped up a few times since.
I think, while far from promiscuous, Diana would be willing to be romantically close with anyone she had a particularly strong relationship with, as long as they understood the nature of it.