Adolescent and child sexuality is studied by developmental psychologists from a research perspective and is of interest to forensic psychologists dealing with abuse and custody issues as well as rape cases. In many cases, it is of interest whether the child in question was sexually active to understand the extent to which an underage minor might have voluntarily participated in sexual activity as opposed to having been coerced. Previously, researchers interested in the applications of their research needed to look to separate books, and forensic specialists needed to look to development books to find the information they may have needed.