I investigated my first sex abuse case in 1974 when I was with the Commonwealth of Mass. Since then I have been involved with hundreds of cases over the past forty years in numerous jurisdictions around the world. The following is as good an explanation as I've read about pedophilia
Here is an excerpt from the Encyclopedeia of Mental Illness:
"Most experts regard pedophilia as resulting from psychosocial factors rather than biological characteristics. Some think that pedophilia is the result of having been sexually abused as a child. Still others think that it derives from the person's interactions with parents during their early years of life. Some researchers attribute pedophilia to arrested emotional development; that is, the pedophile is attracted to children because he or she has never matured psychologically. Some regard pedophilia as the result of a distorted need to dominate a sexual partner. Since children are smaller and usually weaker than adults, they may be regarded as nonthreatening potential partners. This drive for domination is sometimes thought to explain why most pedophiles are males."
Read more: Pedophilia - children, causes, DSM, functioning, therapy, adults, person, people http://www.minddisorders.com/Ob-Ps/Pedophilia.html#ixzz20pXBGoSc