The characters I plan to create pass the Harkness Test. However I'm unsure if I'm able to depict them with non-human genitals (Lamia, or Snake-woman for instance would not possess a human bottom half). If its conditional instead of Yes/No how much depth of detail am I permitted to share? Again, nothing I write will contain anything that doesn't pass the Harkness Test. They all will have dialogue with the Main character, most often possessing a higher intelligence and physical ability (Humans = weak, logic).
Non-Human genitals are fine as long as it passes the Harkness Test. Yes, theoretically it's not a high bar to beat.
I don't get you question. Your creature does pass the Harkness test, right? You want to know how much of it's sexual anathomy you can share? I think you can safely go full out... Wait for a more eminent opinion though, I just a passerby.
I agree with Damage. Even if your character's body was 100% an animal you'd still be within the guidelines as long as they clearly expressed human-level intelligence
Somehow... I now, REALLY really really want to read somebody's take on a story that starts with Dogs playing poker...
Thanks everyone, your answers allowed me to get some idea of the rules and I feel green-lit for my project.
So just going off on things I know you can get away with or I'm assuming because I have. You can make something that physically is just a wolf, but as long as it can talk and communicate properly while being properly grown, it's acceptable. It's also a powerful lightning elemental capable of one shotting even creatures who are electrical resistant by nature, but that's neither here or there. Basically: Can it talk? Yes. Is it sexually mature? Yes. If yes to those two things, you're fine.
If your creature passes the Harkness test, you can physically depict them any way you want. The only restriction is that creatures with humanoid features have to satisfy the underage rule as well.