The type of incest most often reported in the Western world is father-daughter incest. Incest between adults and children is a form of child sexual abuse. This form has been shown to cause one of the worst forms of childhood trauma, a trauma that often causes serious and long-term psychological damage, especially in the case of parental incest. Stepparents are more likely to abuse stepchildren than biological parents are to abuse their children, because people typically care about their own children more than they care about their stepchildren the Cinderella effect. It is suggested that the Westermarck effect prevents a person being attracted to anyone whom he lived in the same house as during his childhood, hence most people are never sexually attracted to their siblings or parents.