I'm probably being dense , and I apologize. But I'm not quite sure of your meaning. "Illicit" actually means forbidden by laws, rules, or culture. And whenever I read the word, the connotation I get from it, which may not be right, is of something hidden and dirty (as in wild or perverted). So I'm guessing, that might be what you meant, @big-n-tall? If not, I hope you wouldn't mind explaining further.
Gman