One take is that several legions of fallen devils (giants) possessed men to sleep with the women. Men can be actively or passively possessed. We often in language supplant the figure for the reality, or the reality for the figure. We call St. Thomas the "Angel of the Schools." But he is not an angel. Christ in Holy Writ is referred to as an Angel.
I remember reading Brownson and he attempted to explain dark people. He said that the third son of Noah, Ham, traveled furthest from the Ark, into Africa, where the people turned into a darker color. Promote this theory at your next biblical conference!