Oddly enough there was a Boston Legal on this very topic not too long ago. Now, I know citing a TV show isn't a very credible source, so don't accuse me of thinking this is 100% correct. However, the subject of debate on the show was a case something like this: An 18 year old man had consensual sex with a 16 year old girl. Under Louisiana law this was defined as child rape and the man was given the death penalty. So, uh, I'm not sure if that's really how things work down in the Bayou, but surely everyone can see the injustice in that. Again, I'm not really sure if that's how things work in the real world.
Anyway, I can only trust William Shatner so much. Perhaps a real lawyer could comment.