Do you have parents? Are your parents human? Do you have one or more siblings who are not your twin/triplet/etc? If you have answered "yes" to any of these questions, then it's entirely likely that your parents have had sex. Disgusting, innit? In fiction, it's common enough to see a child react with curiosity to their parents in a Primal Scene. As they get older, however, the very thought that their parents might be getting it on is enough to send them searching for some Brain Bleach. Examples of Parental Sexuality Squick include: