On Incest and Posterity, in Manga

Mangas such as 'Flower of Evil' and 'Boku wa Imōto ni Koi o Suru' are shoujo works where the main couple are involved in an incest-based romance. There are also mangas where the main story does not involve incest but perhaps it is suggested in a side character. Incest is also a popular theme in yaoi manga.

I'm not a prejudiced person but I must say that before I say something on this topic, I would like to at least have some facts at my disposal, because too many people are ignorant and their tongue sways way to fast - even before their neurons connect - because I don't believe that there are people who are born stupid in this world.

Few weeks ago, I was reading Daughter of the Nile, and someone posted this in the forum and I want to share this with anyone who is reading this.

Got this on a forum discussing the morality and sensibility of Pharaohs marrying their sisters.

(From Mangafox)

Actually, common birth defects for incest, is blue blood, and weak constitution. Note though scientifically, there is no medical problem for having children with a blood relative. Nor does the bible, Qur'an, or any other holy scripture have any standing on the matter. They don't say its bad nor do they endorse it. Incest doesn't cause birth defects in the sense that you get them for having sex with your siblings either. Basically incest limits the genetic information that can be passed on. In turn this causes for normally recessive traits to spring up due to the lack of dominating traits.

A depiction of Ankhesenamun, wife and
sister to pharaoh Tutankhamun

That being said, most royal family's, especially during the time period of this story, employed royal concubines. These woman offered pleasure to the King, as well as bare children in case of assassination or death of the First Prince. This usually offered a much diverse genetic backing for royal family's during the time period. Incest itself didn't become a problem till the advent of Catholicism and Christianity. These along with Islam and Judaism, pushed for a single man and single woman relationships. As these religions became more prevalent, thus the common stigmas of incest came into effect.