In order to serve as clergy, they have to be "willingly celibate." That led to their outlet for young boys.
And yes, doctrine of demons.
An interesting side note-
About four years ago, I took a Human Sexuality course in college, which was taught by a Christian instructor, who also had his own practice as a therapist for sexual abuse victims, sexual dysfunction, etc. So he told us (and provided the stats to back it up) that when men are isolated and not given access to women for sex, they often (but not always) turn to other men for sex. When the men are put back in an environment where they have access to women, they stop having sex with other men and turn back to women for sex. They also don't think of themselves as homosexuals, or bi-sexual. This happens in situations such as prison, military, and other situations where men don't have access to women.
So this makes me wonder about priests/clergy who turn to little boys instead of women, when it's obvious they could have access to women in their churches. There's something more brewing here....