Bit of legal trivia - Louisiana actually has a different legal framework, based on French law. So, some of their definitions are just plain different than the rest of the country, even taking into account every state is a little different.
Here, Aggravated Crime Against Nature (which, if you look at the definitions, isn't particularly the same as Crime Against Nature), appears to be whenever a victim resists, is prevented from resisting, or is incapable of giving consent.
Here, Aggravated Crime Against Nature (which, if you look at the definitions, isn't particularly the same as Crime Against Nature), appears to be whenever a victim resists, is prevented from resisting, or is incapable of giving consent.