Incest was not taboo

Incest was not taboo
2007.06.12 2:40

Incest was forbidden because it was the easiest way for mating. Probably before civilisation, many humans kept on practicing this for too many years. Incest became taboo mainly from economic reasons. Suppose if we got married to one of our parents, we can inherit their property. But remember we can automatically inherit their property because we are their child, so we don't have to get married to them in order only to inherit their property.
If we got married to a person from other family, we can inherit property that belongs to other family. From the same reason even if we got married to one of siblings, we find no economical merit on this since our siblings merely inherit a part of our parents' property. That's why we are always encouraged to get married to a person from other family that owns more property than us anyway.