Jonathon Haidt's provocative question:
Julie and Mark, are sister and brother, they are on summer vacation from college in France. They are staying alone in a cabin near the beach. They decided it would be interesting and fun if they tried making love. They use two forms of birth control. They had fun, but they decided not to do it again. They keep that night as a special secret between then which makes them feel even closer to each otherwhat do you think about that? Is that okay?