MONO reviewed Incest and influence by Adam Kuper
Review of 'Incest and influence' on 'GoodReads'
3 stars
Apparently Darwin was obsessed with incest as much as evolution. Even has a book on it: The Variation of Animals and Plants under Domestication. Seems like there would be more science on this, I'm probably not looking in the right places.
Looked into a few other books but they were only concerned with psychology.