All human societies have a bias toward lighter skin, not so much a racial bias, but a skin tone bias. The ruling class in all societies of dark skinned people is lighter than the subject/citizen class. If a very dark usurper manages to upset the order and become the main dictator or chief or king or whatever he marries his children to the lighter members of the group.Conquest by a darker invader ends with the same phenomenon. The ruling class, the invader overlords select mates for themselves and their children from the lighter members of the conquered people or their own people and the ruling class lightens over generations. Only in very rich economically advanced societies is this less true. But somewhere in Zaire parents are asking their son, “Isn’t she a little dark?” No amount of laws and societal regimentation will eliminate this phenomenon. It is innate. In a wealthy society there is much more mixing of color but the ruling class will still be lighter skinned than the ruled. There are some genetic ramifications of this phenomenon but they are unmentionable in modern society.
Not buying it. I do think that overall among humans, it is desired that females be lighter than males.