The document that gave the 75% figure has been removed, but
here is a pretty good summary of the problem of adults preying on young women in California.
And
here is a teen-oriented document emphasizing that not all cases of statutory rape are prosecuted, clarifying the differences in penalties depending on the age difference, and encouraging pregnant teens not to avoid getting health care for fear of getting their partners in trouble.
[I realize that these points are somewhat off-topic, since the vast majority of the victims of clergy sex abuse were boys, and I certainly don't want to minimize what happened to them just because boys can't get pregnant. But I did want to address some of John's statements.]