Quotes from: 
Introduction & four chapters from

Jay R. Feierman (ed.)

Pedophilia: Biosocial Dimensions

Springer-Verlag, New York (1990), ISBN 0-387-97243-9 

Introduction 

Most of the lay and professional literature although voluminous, reflect a narrow anthropo-, ethno-, and chronocentrism that precludes any real understanding of the topic with anything more than the preconceptions of our times. [...]
[...] This volume adds to this data base by including new, biosocial contribution from the perspectives of history, political science, sexology, biology, primatology, anthropology, experimental and developmental psychology, and psychiatry. What results is a transspecies, transcultural, and transhistorical perspective that gives new biosocial insights into the roots of pedophilia as the phenomenon is found in contemporary industrialized societies.

Bullough V.L., History in Adult Human Sexual Behavior with Children and Adolescents in Western Society

In fact, adult/adolescent sexual behavior has not simply been tolerated throughout much of history but, in some time periods, has been the norm. This attitude can be illustrated by a brief, descriptive listing of some famous or near-famous adult individuals in history who were involved in some form of sexual behavior with at least one adolescent or near-adolescent. 

Mackey W.C., Adult-Male/Juvenile Association as a Species-Characteristic Human Trait: A Comparative Field Approach

The purpose of this chapter is to explore, in a systematic manner, the character, trends, and variations of the association between adult males and juveniles across a wide array of societies.
The adult-male/juvenile relationship reflects patterns of behavior that have been found in all human societies that have been studied. The systematic availability of a stable adult male to the offspring of mothers appears to be a universal event.

Okami P.; Sociopolitical Biases in the Contemporary Scientific Literature on Sexual Behavior with Children and Adolescents

This chapter explores certain tendencies within that body of vitimology-based literature sometimes referred to as the "new research" and writing on the subject of incest and child sexual abuse. [...]
Most of the writers in question view themselves not only as social scientists but also as social critics. An assumption of moral purpose, sometimes bordering on self-righteousness, repeatedly emerges from a reading of their work. Indeed, these writers typically display many of the attitudes associated with what Becker (1984) terms "moral entrepeneurs."

Waal, F.B.M. de; Sociosexual Behavior Used for Tension Regulation in All Age and Sex Combinations Among Bonobos

Humans' close primate relative, the bonobo, shows a large amount of intergenerational sexual behavior. [...]
Yet, the specific context in which intergenerational sex occurs among captive bonobos suggests an important additional function, which also applies to this species' intragenerational sex. Sociosexual behavior occurs in all possible age and sex combinations as a mechanism of reassurence and appeasement. This function of sexual behavior patterns does not interfere with the fertilization function of these patterns, because males appear to limit penetration and ejaculation to contacts with mature females.