A significant percentage go after any kid they can get ahold of, regardless of the sex. There are women who abuse both little girls and little boys, as well as men who do the same.
Some perverts are fixated on control, or despoiling purity, or orgasms rather than the bodies of their victims.
What is true, however, is that an adult who is not sexually attracted to any but the opposite sex are generally safer around kids of their own gender.
It is an incontrovertible statement. A female pedophile is not, after all, a male. A male who has sex with a male IS a homosexual ~ the condition is defined by the act.