I'm concerned about what Amazon will allow since their guidelines are so vague, or in the case of what I am writing, a gray area.

In the stories I'm writing, human beings are transformed into sentient animals, half-animals, or objects. In several instances normal human beings have sexual relations with these transformed people and I don't leave it vague at all. In addition to that there are mythical creatures like Sphinxes, centaurs, werewolves, and such that have sexual relationships with normal humans. 

I have seen works for sale on Amazon that seem to have these kinds of elements, but there is a difference between what is allowed, and what people have managed to sneak through. I have other works for sale and I don't want to be banned.

I know this is a weird question. I'm currently writing an anthology of twisted versions of well-known fairytales, myths, and fantasy stories. I'm exploring all the bizarre elements of how their worlds work and what would happen if we followed those bizarre elements logically to such a far degree that the situation is utterly insane, particularly how the romantic relationships and sex lives of the characters are changed.

In Greek mythology Zeus appeared as a swan and seduced a woman, for example. In a graphic retelling of that myth is a sentient god-being who becomes an animal for seduction considered bestiality? 

I really don't want to tone those parts down too much because they set up great sequences with couples counseling later, and making them too vague ruins what I explore in those parts.

Are there any concrete and clear do's and don'ts to approaching these situations? What can I do to comply best without destroying the experience and intent of the stories?

My thanks in advance for any help.