It The Righteous Mind, incest was one of the scenarios that Haidt used to test purity. As I recall, it went something like this:
A brother and sister are renting an isolated cabin on vacation. During the vacation, they decide to have sex. Neither are in a relationship. They are both disease free. The brother has had a vasectomy and the sister has undergone tubal ligation, so there is no risk of the sister becoming pregnant. Due to their isolation, no one knows that they've had sex. At the end of the trip, they decide that, while they enjoyed having sex, they will not do it again in the future.
People who described themselves on being on the left were less likely to say that anything morally wrong had occurred.
It The Righteous Mind, incest was one of the scenarios that Haidt used to test purity. As I recall, it went something like this:
A brother and sister are renting an isolated cabin on vacation. During the vacation, they decide to have sex. Neither are in a relationship. They are both disease free. The brother has had a vasectomy and the sister has undergone tubal ligation, so there is no risk of the sister becoming pregnant. Due to their isolation, no one knows that they've had sex. At the end of the trip, they decide that, while they enjoyed having sex, they will not do it again in the future.
People who described themselves on being on the left were less likely to say that anything morally wrong had occurred.