From what I have seen, the numbers of paedophiles attracted to males or females is about the same. The numbers of victims, and whether they report such, I'm not sure about, and it's possible that more females are victims. Haven't looked at this in a while.
The evidence for sexual arousal in adult males to images or fantasies involving quite young children - as much as 20% minimum in some studies, and often greater - is mentioned in one of the books written by Dr Sarah Goode, who did some research into paedophilia. I've read both books but I can't remember in which book these studies (and surveys) were cited - a total of eight I think.
Sarah D. Goode - Wikipedia