1. Some People Are Socially Inept
Some people are socially inept, and their social ineptness prevent them from socializing with other people effectively, let alone have sex with them. They may not know how people work or why people behave. They may keep to themselves all the time. These people are not functional beings, and so, they are removed from the gene pool.
2. Some People Are Ugly
Ugly people are unattractive. They can't attract a mate. No one wants them. Everyone finds them hideous and disgusting. So, ugly people are out.
3. Some People Are Fat
Fat people are unattractive. They may be a bit better off than ugly people, if they have a beautiful face, but not by much. No one wants them. Everyone finds them disgustingly fat and makes cruel comments/jokes about being fat. They are told that they just have to go to the gym to lose weight, but they can't afford a gym membership. They may run or walk around the neighborhood, doing aerobic exercise weekly, but that's only good for their heart health, not physical shape/physique. And they may be trapped within easy sources of energy-dense, nutrient-low foods and with no education about healthier food choices. So, they live in a perpetual vicious cycle of obesity and thus are out of the gene pool.
4. Some People Are Stupid
Stupid people are unattractive. No one wants to be with stupid people, because of how stupid they are. They may share traits with ugly and fat people, so the perception of stupidity, not actual stupidity, affects them. It is possible that they may drink Diet Coke and eat monosodium glutamate-laden foods all day and thus lose brain cells (due to the excitotoxicity of aspartame and monosodium glutamate content) and gain weight; then, they really become fat, ugly, and stupid.
5. Some People Hate People
Some people are misanthropic. They want to avoid people and social interactions at all cost, preferring the life of a hermit. As a result, sex is not for them.
6. Some People Are Not Interested In Sex
Some people really are not interested in sex. They may appear very attractive in all ways, but they are just not attracted to people of the opposite sex or people of the same sex. As a result, they don't have sex at all and may wonder what the big fuss is about among people who do have sex.
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