Throughout history humans needed to find a sexual partner and ultimately produce children, or otherwise there is no humanity anymore, and that, without this understand of in the role of drive for sex, or the libido0, it’s not possible to fully understand why humans behave the way they do. As much we like to think that we are fully conscious of our desires or actions and free to choose, we certainly aren’t free to choose the taste of a food or the scent of a flower, or what we are attracted to or what we find beautiful. To think that the environment is completely responsible by our desires0 or the belief that we are born equal or that we are equally valuable, it couldn’t be more of a mistake when it comes to nature’s rules0.
Everyone has a certain understanding that we aren’t all equal and that the sort of differences between people can be seen as objective traits or subjective traits0, of physical characteristics and personality ones, mind/body dualism coexistence0. Beauty, social status, wealth, genre, are not as cultural constructions as we are taught to believe, sure, culture can influence the way we perceive things, but there is always a biological basis for what we perceive as good for us, for it’s rooted in instinctual biological basis of the propagation of our genes, the core of our beings, and even if we decide to not have children or have worries about the next generation, these instincts will still act upon us and greatly influences our perception  upon all things, including the value of other people by our eyes0 or value by other people’s eyes. The thought that millions of years shaping human evolution, 200 thousand years since as homo-sapiens and 50-60 thousand years since the separation of the three main human subspecies, do not hold an influence on us is nonsense0.
Either following the Out-of-Africa or multiregional theory in the origin of homo-sapiens-sapiens species0, different populations developed in different environments across the globe for thousands of years without contact, giving people enough biological differences that can be noticed by look alone, as well as giving biological differences that cannot be perceived solely by sight.