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Originally Posted by Arsenic7
That's really not how natural selection works.
There are a lot of genetic disorders that lead to a decreased ability to reproduce, such as dwarfism, or albinism, or autism, etc, that persist despite there seemingly sexually detrimental nature.
Also, genes aren't the only cause of physical disorder.
Just thought I'd point that out.
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It really is how natural selection works.
Many of the defects persist because the desirable nature of sexual reproduction in terms of genetic fitness, this allows the defects to persist, and the defects themselves have evolved to persist. A genetic defect has a greater chance of survival as a recessive than a dominant trait, which is why so many of them are able to hide in our genes, while dominant ones tend to be due to spontaneous mutation and other defects in cellular reproduction (such as downs syndrome).
Deciding not to reproduce either as a conscious effort with birth control, or due to a lack of sex drive is nothing new, but it is new to to that genetic line, you are the product of people who have reproduced in an unbroken chain. Its as sure a defect in the end as one thats fatal at birth genetically speaking.