That said, it is possible to have a non-abusive, consensual sexual relationship with a cousin or even a sibling. People have been having romantic and/or sexual relationships with first cousins (and every other degree of cousin) since the beginning of time, all over the world. They’ve been very, very common throughout history. Romantic/sexual relationships between cousins became taboo in the Western world during the 19th and early 20th centuries because of s---ty science and scary propaganda, basically.
As far as I’m concerned, if you’re an adult and your cousin or even sibling is an adult and you have no history of abuse between you, there’s no power imbalance in your relationship, and you’re mutually sexually attracted to each other, it’s your business if you want have a sexual and/or romantic relationship. There is no rational or even scientific reason why consensual sex between cousins or siblings is problematic. If you’re not hurting each other in any way, if you both want it, then there’s no good, objective reason why you shouldn’t do what you want or why you should feel guilty about it.
Agreed, of course.
The entry goes on to debunk some of the Discredited Arguments used against such relationships. It also talks about Genetic Sexual Attraction. It is good to see another blog giving reassurance to cousins and siblings.
Thanks to The Thinking Asexual for the link and the entry.