This fantastic PDF comes to you free from many creative folks out in the internet. You can read more about it over on dndwithpornstars.com
Personal thanks to Zak S. and Jez Gordon. Thanks for creating a superb piece of work, this is something that has already found its way into my game and for that I am grateful.
From weird creature mutations to poisons and even small adventures this one stop old school shop of RPG sweetness is as beautiful as it is useful.