Inheritance Of Human Consciousness From Intermarriage With Humanoids
The Mehram relations are prescribed to avoid conflict within the family. It comes with civilization. Mehram relations increases when the civilization gets more complexed. Marrying in other casts and cousin marriage is discouraged . In the case Adam’s siblings the civilization was too simple. Marrying the siblings could be the only option available. The reason of conflict within the family was not strong. So if they marry each other it can be seen as such. However, it is all speculation.