I wonder if anyone's doing a study on the Duggar family and their rather obvious tendency toward pedophilia.

When is it lawful? Certain income/net worth threshold he didn't meet?

All sexual activity with a minor should be illegal. For that matter, drop the word "statutory" from the phrase "statutory rape." If the victim can't consent, there's no statute about it, it's simply rape. No need to qualify it as something lower.