What a surprise
Incest doesn't necessarily cause genetic disorders or birth defects. It increases the frequency of homozygosity, which in turn, increases the chances of two harmful recessive alleles combining. When two harmful recessive alleles combine, that forms a harmful recessive trait.
Basically, in other words, inbreeding requires a genetic predisposition in order for there to be an increased risk in birth defects. Both parents must share a harmful recessive allele in order for there to be an increased risk of birth defects or other problems.
If you have a perfect genepool of alleles, incest is 100% more responsible than traditional procreation.
This is the reason royal families were so insistent on "keeping the blood clean" - without even realizing it they were promoting the most healthy of genetics - keeping bad alleles out of their gene pool. Sometimes they messed up by engaging in inbreeding over multiple generations and failed to understand that their blood, while genetically purer than most, wasn't as pure as they thought it was, but the logic behind royal incest was sound.
Reproductive incest is more risky today than it was in premodern times. Before the advent of modern medicine and hygiene, infectious childhood diseases killed off almost all children with bad genetics. The only children that survived to adultood were those with robust immune systems who harbored few deleterious alleles. This phenonenon has been dubbed purifying selection. The people who made it to reproductive age tended to be more "immune" to the complications of incest.
It could be argued that widespread multigenerational cousin marriage in the Middle-East only really began to cause serious problems after the introduction of vaccination and modern medicine ended purifying selection and allowed individuals who in former times would have died in childhood, to reproduce and produce damaged offspring.
This study shows that in spite of sibling marriage having been common in Ancient Egypt, inbreeding didn't have the negative effects that it would have in today's day and age because at the time, the Egyptian population's genepool was low in harmful alleles due to purifying selection. A relatively high percentage of the children born to brother-sister couples were healthy enough to not die in childhood.
Sex has always been about more than reproduction for humans. It's about pleasure, bonding, and intimacy, and reducing stress. Sex is likely a basic human need. The only way for men to avoid touch deprivation is by having sex with women because we evolved to dislike being touched by other men. Studies show that men who live without sexual partners for long periods of time have a reduced life expectancy by up to 20 years. Sexual pleasure has always been an important part of human society, given how many myths and legends feature references to it, not to mention other art forms such as sculptures and paintings.
What was seen as harmful before Western degeneracy took over the world is female promiscuity. It erodes social cohesion, and people who encouraged it have always been viewed in a negative light. When women are sexually liberated, they indiscriminately reward men with attractive genes with love and sex and leave less attractive men with little motivation to contribute to society. Female promiscuity (including serial monogamy) is basically polygamy without any of the benefits of polygamy.
Sex between first-degree close relatives who already have a close familial bond is not really promiscuity, which is defined as "indiscriminate in choice of sexual partners, or having many sexual partners". A rational father who isn't a cuck would rather see his young daughter sleep with her brother than get pumped and dumped by Chads. It's in his interest that his son gets to enjoy the health benefits of sexual intimacy, and it's also in his interest that men who are complete strangers don't get to enjoy his daughter without his permission.
Anyone who doesn't have great genetics should try to avoid impregnating close female relatives. This can easily be accomplished by keeping track of when the woman or girl bleeds and avoiding vaginal intercourse on the days when she is fertile.
- Days 1-7 of a woman's menstrual cycle are considered infertile
- Days 8-19 are considered fertile; considered unsafe for unprotected intercourse
- Day 20 through the end of the cycle are considered infertile.
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Incest is last bit of hope you have
I think the Bible says it was a sin though...
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