There are plenty of cases where sexual predators have equal access to both boys and girls, but chose to molest one sex exclusively...It's a fallacy that applies to other types of child sexual abuse as well, that the sex of the victim bears any relationship to the sexual orientation of the predator. It doesn't, child sexual abuse is a crime of opportunity, and most of those who prey on children will take their victims as they are able to find them, regardless of their sex.
And there are cases where sexual predators put themselves deliberately in a position to have access one specific sex. (I recall a case recently involving a girls swim team coach molesting under age girls on his team; presumably, if he had wanted to, he could have sought a position coaching a boys team.)
In fact when I think about it, the vast majority of news stories I have read over the years involving serial child molestation have involved (even those involving incest) predators who molested one sex exclusively...
I think it's fair to assume that in general, heterosexual child molesters are attracted to children of the opposite sex, homosexual child molesters are attracted to children of the same sex, and bisexual child molesters attracted to both.
