Whoa, bit of a hornets nest that. The reason incest is frowned upon and not legal is that any pregnancy would give birth to a child with increased risk of dissabilities due to how genetics works in our type of society that has chosen to mix it up. The other way of doing it is a tightly related society where all of the bad genes have been bred out as the only babies to survive from a tightly related society are the ones with no genetic defects including recessive ones.
Posted: 19 Mar 17:56