I don't think there's such a thing as "nonstatutory rape," since I'm pretty sure most states have statues that prohibit nonconsensual sex. The point of distinguishing a certain kind of illegal sexual activity as "statutory" is to highlight the fact that it's only because of the statute that anyone notices at all; most people (religious fanatics aside) would probably have no problem with consensual sex between, say, a 19-year-old and a 17-year-old.