The evidence indicates quite the opposite. One must challenge any statements about the dangers of cousins marrying and make people aware of the facts. That way the next generation may give up the myth. I'm not against healthy relationships. I've not come across any research to suggest that cousin relationships, between two consenting adults are damaging psychologically in any way.
Cousins share an exclusive history with each other.
It's a relationship where you don't have to create a shared history or experience. You have a head start on intimacy, in a sense the work is already done for you. No part of this web site may be reproduced in any manner without consent.