GRRM: The Targaryens loved incest. They just fucking LOVED it. You think cousin marriage is too much? These guys were marrying brother to sister. They thought it was *weird* to marry outsiders.
ME: Okay…
GRRM: Also all the incest made them insane.
I don’t mean to make anyone feel old or called out but VC Andrews and Robert Heinlein are not modern authors; Heinlein died just two months shy of his 81st birthday when I was five years old