[bakul]

I has asked friends who would know more about South India. If you have any references about statistics and causes please share. Thanks!

[bakul]

I found one map that may be interest: https://araingang.medium.com/cousin-marriage-in-south-asia-f...

But note that the article is really talking about first-degree incest/pedophila/sexual abuse which is taboo in pretty much every society.