I highly suggest reading the grand jury report on the whole scandal. As the jury points out, most of these men were serial molesters who had over 100 victims. The reason why most of them went after young boys is because that was all they had available. Many, though, had access to young girls. There are stories in the report of priests targeting preteen girls, one of whom was impregnated and taken in for an abortion. The report even mentions a priest who molested a girl when she was only 3 years old.
You can find it here: http://media.philly.com/documents/grand_jury_report.pdf
In any case, your leap of logic is ridiculous. Sexual orientation does not equal pedophilia or ephebophilia. The vast majority of the people in our country (the world, even), regardless of sexual orientation, are content to have consensual relations with people who are of legal age. There will always be those people, though, who are more than willing to abuse a position of trust and power, especially when they are deprived of the right to pursue a fundamental human desire.