Consensual incest is very common. You know people who have been involved, whether you know it or not. Sex with two adults are considered as legal. Before deciding for further progress you should read the following lines and in case of any query intimate me:
Marriage of related individuals is still common in numerous societies including people from South-East Asia, Israel and Saudi Arabia. Some research even suggests that marriages within the family are more stable than those between non-relatives. In some cultures it is thought to be a method of providing support and protection for women.
Indeed the notion of negative effects of “inbreeding” don’t seem to have been present even in English communities until around 1888 (though marriage to a sibling is banned in Christian dogma). Thus current Western revulsion at relatives marrying may correspond more to echoes from the Eugenics programs of the early 20th century than to any long held community beliefs. The cost of such partnerings can theoretically be high, however.
Take for example a hypothetical disease characterised by a genetic fault on gene d. Humans have two copies of each (non-X/Y sex) chromosome, and thus each gene. Most people in a population (say 99%) will have two copies of the healthy D gene (DD). One percent, however, will carry one copy of the diseased gene (Dd). The disease is recessive. That is, people are healthy unless they have two copies of the diseased gene (dd).
If your mother carries one copy of the gene (Dd), you have a 50% chance of inheriting it. So does your sibling. If you marry a random person in the population (who has a 1% chance of carrying the disease), the probability of you both carrying the defective gene is 50/100 * 1/100 or 0.5%. If you were to marry your sibling, the probability would jump to 50/100 * 50/100 or 25%.Research has shown that for consanguineous partnerings, the prevalence of genetic disorders may be up to twice as high as those from unrelated marriages.
This doesn’t mean that there will be genetic problems, just that the chance of them is higher. In fact if you look at the history of European royalty (with a history of consanguineous marriages) you can see some of the genetic problems surfacing – think Alexis – son of Tsar Nicholas II – who suffered from haemophilia. In a visit to Indeed if you go to the Kremlin and look at clothing from the royal lineage, you will see that many of the queens had extremely small feet – another genetic abnormality.
Similarly in other closed populations where people generally marry relatives through religious or geographical isolation, genetic problems will increase in prevalence (amongst the Amish in Pennsylvania or in Hasidic Jewish populations in New York for example).
So there are some good reasons for banning incest. But many of the laws against it were laid down long before genetics was understood. So some other forces must be at play.
With the availability of extensive genetic testing, any potential problems could be easily screened out – in techniques such as those employed in Israel – where couples can be screened for common genetic incompatibilities either prior to marriage (for those opposed to abortion) or during pregnancy.