The longer we live and the more we know about the world, the less we are constrained by social norms and taboos. If you had read One Hundred Years of Solitude by Marquez, you definitely recall the badge of incest that went along the protagonist family's history. Moving a hundred years forward, should we be condemned for having feelings for siblings? What happens if you see a developing body of your brother or sister? Is it resentful or, quite the reverse, attractive? Should you feel sinful if you have erotic dreams including your family members? Should you acknowledge or ignore your family's sexuality? And if you're related, can you lawfully fall in love? Genes, past, mutual parents. Sometimes the closest to your heart are those who are biologically alike and who can feel what you feel in an unexplained, brother/sister-like manner. I love this kind of films, even though in reality the society's judgment might be a little bit more radical.
