Talk:Kagamine Rin & Len/@comment-2600:387:A:7:0:0:0:65-20190805205801/@comment-53539-20190805223845

Incest and inbreeding among humans is bad because if children are born, there is a high level chance of serious deformities. That's why its not encouraged at all, because you bring into the world a life thats got a high chance to suffer the consequences. Thats why its shunned in general and not considered a bad idea.

I could add a bit on evolution here.

The Kagamines were conceptualised as a "twins" but not meaning the same as humans in real life, they were androids like Luka and Miku, so it was never confirmed "twin" meant "brother and sister" just "a pair of vocals". As Wat describes it "one soul split between two bodies". Because their androids and in turn, robots, so not being human makes a difference. Their objects even within their own concept, some other Vocaloids are suppose to be fairies, elves, Frankenstein monsters, angels, etc, so being a robot actually puts their concept fairly low on the pecking order of what they are and in comparison to some of the other Vocaloids, who are actually conceptualised as living things, going to have a very different approach.