Inbreeding

Tempting as it might be, we're here to tell you why it may not be a great idea to sleep with your hot sibling.

Sources:

http://www.medicalbag.com/grey-matter/impact-of-royal-inbreeding-part-iii/article/472635/

https://blog.23andme.com/ancestry/the-end-of-a-dynasty-how-inbreeding-doomed-the-house-of-habsburg/

https://www.thevintagenews.com/2017/03/23/when-charles-ii-of-spain-died-the-autopsy-stated-that-his-body-did-not-contain-a-single-drop-of-blood-and-his-head-was-full-of-water/

http://www.habsburger.net/en/chapter/charles-ii-last-spanish-habsburg

https://www.puppyleaks.com/done-bulldogs/

https://www.newscientist.com/article/dn16418-comment-good-riddance-to-british-bulldogs/#.VBpYVLQhMVY

http://www.independent.co.uk/news/science/english-bulldog-health-problems-inbreeding-pedigree-dog-breeds-breeders-a7160041.html

http://genetics.thetech.org/ask/ask243

https://en.wikipedia.org/wiki/Inbreeding#Laboratory_animals

http://genetics.thetech.org/ask-a-geneticist/double-cousins-share-one-quarter-their-dna

http://www.genomenewsnetwork.org/resources/whats_a_genome/Chp4_1.shtml

https://www.psychologytoday.com/blog/the-mysteries-love/201505/are-we-attracted-people-who-look-us

https://www.theguardian.com/theguardian/2003/may/17/weekend7.weekend2

https://en.wikipedia.org/wiki/Westermarck_effect

http://www.bbc.co.uk/blogs/wondermonkey/2011/11/bred-to-destruction.shtml

http://www.telegraph.co.uk/science/2017/10/13/extreme-horse-breeding-leaves-animals-looking-like-cartoons/

https://fivethirtyeight.com/features/the-complicated-legacy-of-a-panda-who-was-really-good-at-sex/

http://www.englishmonarchs.co.uk/haemophilia.html