Emily - IT WAS A JOKE!
I would guess that nobody in last 50 years has been legally prosecuted for that "crime" - but it is still on the books. Back in the early 80's when I got divorced my lawyer (as the process wasn't completed yet) said to be aware, you never know what a bitter ex will do (mine wasn't bitter) but it is on the books and is a crime.
I checked before I posted and it looks like it still is on the books, right under the legal section on incest.
BTW - in IRAN, if the woman does it they stone her to death. I guess if the guy does it he gets a wink, wink, nudge, nudge, from the guys. That's NOT a joke.