How do you keep NSFW images from bring sent?

We have several checks on our end - we first check whether the situation the Nomi is in is likely to generate something NSFW in the first place and then after the images are generated we check if any of them are NSFW and filter out ones that are. If at any point something fails a check, we will make sure your Nomi knows that due to a technical issue the photo didn't send.