It technically doesn't require a "patch" that I know of, as there is a place in the menu for codes, which is specifically there to type in "Pelican", which then unlocks the incest titles.
I guess that was one on the older version of the game. I noticed it wasn't there anymore when I started up this edition after copying over my saves, and it doesn't carry the code over now, either. So that's unfortunate. I guess we now do have to download that patch the others had mentioned. Sorry for any potential confusion I may have cause for you!