I find it fairly obvious that natural seating contest must have worked in favor of women more inclined to beautify themselves (whether out of vanity or something else, doesn't matter at all).
Sure, but doesn't that mean that we agree there is no genetic disposition towards liking nail polish/lipstick? The reason people like lipstick is not that they have a genetic disposition to like lipstick, it's because lipstick fakes a sexual signal.