Hi, I've recently deleted some images from this wiki, because they were too explicit for Wikia.
The Wikia Terms of Use state that content must not be "obscene, pornographic, abusive, offensive [or] profane". Obviously, that is open to a lot of interpretation. But the line we have drawn is that we don't allow shock images, images of sexual acts, or images of nudity - and that includes bare breasts and butts, even if only drawn.
I understand that this wiki is based around an adult anime, but that doesn't change the requirement for the content to be within the Terms of Use. So I think the question is: is your topic one that can be documented without explicit content? If it can, that's great. But if it can't, you may need to find another place to build the site.