Re akuperma’s first comment: you obviously do not want to have a serious discussion about child abuse, as you have raised all sorts of straw-man issues in defining child abuse. It does have to be defined, but you have made some foolish proposals and insulted non-observant fellow Jews. Where is your ahavas yisrael? And are you suggesting that there is some vagueness in the Torah about child abuse? Can an adult Jewish therapist (or any other adult Jew) engage in sexual acts with a child that would be permissible between a husband and wife? Is the Torah not clear to you on that subject? I think the Torah is clear to you, but, as I said, you do not want to have a serious discussion about this matter.
Child abuse can be broken down into two broad categories: sexual child abuse, and all other child abuse. The Torah makes it pretty easy to figure out what would be sexually abusive to a child: whatever is prohibited between unmarried adults would also be prohibited between an adult and a child. I would like to hear from someone who can explain at what age a person can consent to marriage, and whether it matters if one partner to the marriage is substantially older than the other.