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https://www.google.com/search?q=sexual+selection&oq=sexual+selection&aqs=chrome..69i57j0l5.4303j1j7&sourceid=chrome&ie=UTF-8&safe=active&ssui=on

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natural selection arising through preference by one sex for certain characteristics in individuals of the other sex.

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https://www.biology-online.org/dictionary/Human

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First, natural selection is not all-powerful; it does not produce perfection. If your genes are "good enough," you'll get some offspring into the next generation — you don't have to be perfect. This should be pretty clear just by looking at the populations around us: people may have genes for genetic diseases, plants may not have the genes to survive a drought, a predator may not be quite fast enough to catch her prey every time she is hungry. No population or organism is perfectly adapted.

Second, it's more accurate to think of natural selection as a process rather than as a guiding hand. Natural selection is the simple result of variation, differential reproduction, and heredity — it is mindless and mechanistic. It has no goals; it's not striving to produce "progress" or a balanced ecosystem.

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Who ere they?
1.) A bipedal primate belonging to the genus Homo, especially homo sapiens
2.) Classified as the smartest animal on earth.
3.) Defined as one of the last type of human kind left today.

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https://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_30

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Female choice
Females choose which males to mate with, how long to mate, and even whose sperm will fertilize her eggs. Some females can eject sperm from an undesirable mate.

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Male competition
Males compete for access to females, the amount of time spent mating with females, and even whose sperm gets to fertilize her eggs. For example, male damselflies scrub rival sperm out of the female reproductive tract when mating.

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Selection makes many organisms go to extreme lengths for sex: peacocks maintain elaborate tails, elephant seals fight over territories, fruit flies perform dances, and some species deliver persuasive gifts.

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Who were they?
1.) an extinct species of human that was widely distributed in ice-age
2.) Lived 120,000–35,000 years ago, with a receding forehead and prominent brow ridges. The Neanderthals were associated with the Mousterian flint industry of the Middle Paleolithic.
3.) Or known as an uncivilized, or unintelligent, or a less intelligent version of us homosaphians