As I am quite expert about the subject, I hope I can bring this old thread to conclusion.
The question "is pedophilia related to heterosexuality or to homosexuality?" has no sense, because pedophilia is simply related with pedophilia.
A Penile plethysmography test was executed with a simple of more than 2000 men.
The question of the study was "What is sexual orientation?".
Sexual Attraction to Others: A Comparison of Two Models of Alloerotic Responding in Men - Springer
Although most persons will say that sexual orientation is an attraction towards a gender, this study proved that this idea is wrong.
Infact, the study came to the conclusion that sexual orientation in humans is an attraction towards a human morfology (physical qualities).
In adults, the morfology is primarily related to the gender.
In children, the morfology is primarily related to the age.
The reason is in sexual differentiation.
"Sexual differentiation is the process of development of the differences between males and females from an undifferentiated zygote. As male and female individuals develop from zygotes into fetuses, into infants, children, adolescents, and eventually into adults, sex and gender differences at many levels develop: genes, chromosomes, gonads, hormones, anatomy, and psyche."
Sexual differentiation - Wikipedia, the free encyclopedia
Each human, male or female, is identical at the first stage of pregnancy: sexual differentiation starts during pregnancy, and continues until adulthood, where the sexual dimorphism reaches the maximal level.
This means that, more adult is a person, more his/her morfology is related to gender. Less adult is a person, more his/her morfology is related to age.
If we speak about pedophilia, we are speaking about the attraction to prepubescent children.
The appearance of a prepubescent child is primarily related to the age, and infact a prepubescent boy is very different from an adult male. He looks more like a prepubescent girl.
I know I am speaking about theory. We will go to the practice now.
What did the researches exactly do?
They performed a Penile plethysmography test on more than 2000 men, and then they label them in 6 categories:
- Heterosexual teleiophiles, primarily attracted to adult females
- Homosexual teleiophiles, primarily attracted to adult males
- Heterosexual hebephiles, primarily attracted to pubescent males
- Homosexual hebephiles, primarily attracted to pubescent males
- Heterosexual pedophiles, primarily attracted to prepubescent girl
- Homosexual pedophiles, primarily attracted to prepubescent boys
Their goal was to understand how different persons of different orientations react to non-prefered categories of persons, so that they were able to understand the logic, the mechanism, of sexual orientation in humans.
See the diagram below
As you can see, homosexual pedophiles have an attraction towards prepubescent girls which is greater than the attraction they have towards adult males.
The statement that homosexual pedophilia is related to homosexual teleiophilia is therefore false. Infact, homosexual pedophilia is primarily related to heterosexual pedophilia.
Heterosexual pedophiles and homosexual pedophiles have very similar sexual preferences: they like about the same human morfology.
On the other hand, morfological preference of homosexual pedophiles and homosexual teleiophiles is very dissimilar.
Compare the two has no sense.
Categories "heterosexual" and "homosexual" were invented by humans: it's not the way that sexual orientation works. They can be valid categories when we speak about teleiophilia, since in adults the morfology is primarily related to gender.
But in general, you can't categorize sexual orientation in in this way: the hypotesis that sexual orientation is a preference for a gender was proved to be false by this study.
p.s.: it is true that many homosexual pedophiles prefer women when it comes to adult. One thing that pedophiles in general like of children is their smooth skin. It is a quality they can't find in adult males, but in females in general yes.
This confirms an other time that sexual orientation in humans is a preference for some physical qualities, not for a gender.