The depiction in the art appears pretty clear to me.
"They can be a great people Kal-El, they wish to be. They only lack the light to show the way. For this reason above all, their capacity for good, I have sent them you. My only son." - Jor-El
Actually, it's very clear.
"Beautiful women offering themselves."
No, it was clearly not rape. It was seduction and murder, but the women 'offered' themselves and the men accepted.
It is clarified further when it says that it was like a dream that, after it's done, turns into a nightmare when the Amazons turned on them.
So if they offer and the men think it's a dream, that makes it exceedingly clear that it's consensual.
I don't think this is something everyone will agree on. After all, "rape by deception" exists in our judicial system, and some could argue that this is exactly that.